I went the economy route
Gigabyte S Series GA-MA770-DSS3
AMD AM2 5000+
2 GIG DDR2 800RAM
XFX 8800 GS Mad Dog 384 Meg
1 SeaGate 500G SATA
1 Western Digital 250G Sata
1 Western Digital 320G IDE External for the backups and Archiving
DVD Dual Layer Burner with Light Scribe
AOC Case and a 450 Watt PSU
I'm uising a 19 inch widescreen TV 1080p for the monitor (not available in the US)
OS WIN XP PRO SP3/ Linux Ubuntu/ VM WARE so i could run my old gamesthat won't run on XP (early DOOM, Slave Zero, Quake, and Descent)
the first game I bought here was Descent 3
this rig plays Crysis and UT3 OK and NFS Carbon, COD4, Doom 3, Quake 4 Great,

Gaming Machine (bedroom): -
Case: Silverstone LC-17 (Black)
Fans: Sharkoon Silent series
PSU: Corsair HX 520W Modular
MB: Abit IP-35 Pro (LA775 P35)
CPU: Intel Core 2 Q6600 'G0' @ 3.2GHz
Cooler: Thermalright SI-128 (w/ Sharkoon)
RAM: 4GB G.Skill HZ DDR2-800
HDD: Hitachi Deskstar 160GB 7200RPM
GPU: Powercolor Radeon HD 4870 @ 790/1100
Cooler: Stock cooler
Monitor #1: Samsung Syncmaster 245B Plus (24" 1920x1200)
Monitor #2: Samsung Bordeaux 32" HD LCD (720p/1080i)
Speakers: Logitech X550 5.1
Input: Logitech G5 (blue), Logitech ultra-thin keyboard
Operating System: Windows Vista Home Premium 64-bit
Media Centre (living room): -
Case: Silverstone Sugo SG-01 (Black)
Fans: Passively cooled for silence
PSU: Akasa Paxpower 420W
MB: Gigabyte S-Series mATX
CPU: Intel Core 2 E6300 @ 1.68GHz (stock)
Cooler: Thermalright SI-128 (passive mode)
RAM: 1GB Kingston Value DDR2-800
HDD #1: Hitachi Deskstar 500GB 7200RPM
HDD #2: Hitachi Deskstar 500GB 7200RPM
GPU: Onboard Geforce 7100 w/ HDMI
Cooler: Passively cooled for silence
Monitor #1: Samsung Bordeaux 32" HD LCD (720p/1080i)
Speakers: Logitech X550 5.1
Input: Microsoft Media Centre keyboard & remote
Operating System: Windows XP Media Centre Edition 32-bit
I play my GOG games on both of these. =^.^=

AMD 3500+, 2 Gb RAM, Ati 3850 HD

My primary computer for new games:
Intel E6750 2,66GHz
ATi Radeon HD2900Pro (outstanding price/performance when ti came out)
2GB DDR2 800MHz
320GB HDD Samsung
sound onboard
WIndows Vista SP1
LCD monitor Samsung 2032BW (20")
speakers: Logitech X-230 2.1
Secondary computer for playing on LAN and surfing:
Intel Pentium IV 3GHz
ATi Radeon 9600 128MB
1GB Ram
160GB HDD
sound onboard
Win Xp Home SP2
LCD monitor Acer 17"
speakers: nearly 9 years old Compaq 2.0 (I wonder they are still working)

Gateway 7811FX laptop computer
Intel P8400 cpu
Nvidia 9800 GTS video card, 512 megs
7200 rpm hard drive
4 gigs DDR3 RAM
Vista 64
17-inch LCD screen, 1920 x 1200 max resolution
Logitech V470 bluetooth mouse
Kensington bluetooth dongle
super-fi 5 in-ear monitors

MB: EVGA nForce 680i LT SLI
CPU: Intel Core 2 Duo E6550
RAM: 2GB Corsiar PC2-6400 DDR2
Video: EVGA GForce 8800GT 512MB DDR3 x2
Monitor: Sony Trinitron 21" Monitor
HDD: WD 250GB SATA x2
FDD: Sony 3.5 USB Card Reader Combo
DVD: LiteOn SATA Burner with LightScribe
LiteOn SATA Combo Drive
Case: Cooler Master RC-690-KKN1-GP
P/S: Cooler Master RP Pro 850W
OS: Win XP32 SP2
Logitech KB and mouse.
Onboard sound for the moment, saving for either a Creative X-Fi Titanium Fatal1ty Professional PCIe or an ASUS Xonar D2X PCIe sound card. (Any opinions on those?)

MB: ASUS P4C800 - Intel I875P
CPU: Intel P4 2.8 GHz HT
RAM: 2 GB TWINMOS RAM
VGA: MSI NVIDIA GeForce 7800 GS
HDD: 400 GB + 80 GB Seagate Barracuda
Sound Card: Creative Sound Blaster X-Fi XtremeGamer
DVD: Pioneer 16X
DVD RW: Philips 16X
Monitor: Philips 107E 17"
OS: Windows XP Pro 32 Bit - SP3
PS: Thermaltakte Pure Power 400 W
A4Tech Keyboard and Mouse

Motherboard: Gigabyte P35 DS3L
CPU: Intel E6750 (@ 3.6 GHz)
RAM: 2 x 1GB Mushkin HP 6400 RAM (@ 900 MHz)
Video: EVGA GeForce 8800GT 512 MB
Monitors: LG Flatron W2242T (Main), Samsung SyncMaster 940B (secondary)
HDD: Western Digital SE16 250 GB SATA2, Seagate Barracuda 320 GB SATA, Seagate Barracuda 500 GB SATA2 (one 40GB IDE drive in external enclosure and one Seagate external 500 GB HDD)
Optical Drive: Pioneer 212D DVD burner
Case: Antec 900
PSU: PC Power & Cooling Silencer 750W
OS: Win XP Home 32 bit SP3
Keyboard: Logitech G11
Mouse: Logitech MX518
On-board sound.

MB: Abit IN9 32x-MAX
CPU:Quad core QX6700 2660.0mhz clocked at 4000.0mhz water cooled
RAM:4GB Corsair XMS2 Dominator 5-5-5-15 Air Flow Fan
Video:PowerColor 4870x2 fitted with EK VGA Water Block-full load temp = 42 and overclocked to 780mhz and 1000mhz on DDR5.
Monitor:Samsung 42" HDTV 1080p , everything running at mainly 1920 x 1080
HDD: WD Raptor 10000rpm 150gb raid 0
HDD2:Samsung 7500rpm 500 raid 0
DVD:Standard DVD writer
Case:Custom built Coolmaster Stacker 1100, I like LAN party's so has Thermaltake Aquabay Lvl&Flow indicator running of a Scythe Kama-Meter.
P/S:Corsair 750 watt SLI Compliant ATX 2.2
OS:Win Vista 64bit SR1
Razer Copperhead Mouse and G15 Logitech keyboard
Sound:Was on X-Fi card but running into trouble running with the 4870x2 and Warhammer Online so switched to Realtek onboard sound.
Runs Crysis Warhead at 35-45 fps at 1680 with 2xaa on Enthusiast setting.

-Intel Core 2 Quad Q6600 G0 (with a Sunbeam Core-Contact Freezer strapped on top)
-2*1 GB Crucial Ballistix DDR2
-Galaxy GeForce 8800 GT 512 MB (non-reference model)
-Auzentech X-Fi Prelude
-Western Digital WD5000AAKS
-LITE-ON LH-20A1L
-Gigabyte GA-P35-DS3P (Revision 2.0)
-Rosewill R6AR6-BK (Don't let the brand dissuade you-it's a surprisingly good case for the money, though it could use a little more airflow.)
-Windows Vista Ultimate x64 SP1 OEM
-old shadow-mask CRT that still works after all these years
-craptastic 5.1 speakers that need to be replaced to do my sound card justice
-IBM Model M 1391401
-Logitech G5 (2005 model, really needs that extra thumb button)
-Thrustmaster HOTAS Cougar + FCC stick mod (Unfortunately, someone broke the stick portion, and thus it needs repair. I just hope the FCC's intact.)
-Thrustmaster RCS + Hall sensor kit
-NaturalPoint TrackIR 4 Pro (Nothing raises immersion and situational awareness in a compatible game quite like one of these.)
Not the best system in the world by a long shot, but it's much better than the old AMD Athlon XP 1800+ system I had to play games on-that is, unless I'm playing older games that act up on the newer hardware (for instance, Crimson Skies has garbled text due to an old NVIDIA driver flaw that they won't fix, Rocket Jockey has control lag likely due to the new CPU, and many other games have some issues with Vista). Maybe some of those issues could be alleviated if I could figure out how to set up Windows 98 and 2000 virtual machines on this thing.
I also have older hardware for older games, but I need to assemble it all at the moment. Some of it includes an Abit BP6 with dual Celeron 533s and 768 MB of PC-133 SDRAM, an ATI AIW Radeon 8500 128 MB, a STB Voodoo 2 12 MB, a Creative SB AWE64 Gold, and other old things that would work better with the classics.

Was was tempted to say:
"Entire box: 1337" and leave it at that... But no one would believe me.
CPU - Intel Core 2 Duo - E8500 - 3.16ghz
Ram - 2gb Hynix
GPU - Geforce 8800 GT 512
OS - WinXP Home SP3
Mouse - G5
Keyboard - g15 (orange version)
I know. Hardly "1337"... Why do you think I wanted to do that?
Can't remember (or know) the rest... But I could find out if anyone really cares :p
Karl

Desktop:
iMac 2.4GHz Core2Duo
2GB Ram
ATi Radon 2400XT 128MB
250GB SATA HDD
320GB USB HDD
OSX Leopard/Windows XP (Bootcamp and VMware fusion)
Laptop:
Dell Inspiron 1525 Core2Duo
2GB Ram
Intel GMA x3100
200GB SATA HDD
120GB USB HDD
Windows XP and (shh) OSX Leopard....

Operating system: Windows XP Service Pack 3
Motherboard: Dell Demension DM501 Intel
Power Supply: Corsair 620W
Processor Speed: 2.99 GHz (actually 3.0)
System RAM: 3.00 GB
Video Card: 512 MB ATI Visiontek HD4850
Sound: Sigma Tel audio

OS: XP wSP3 /dual-boot/ Ubuntu 8.04
Motherboard: CPUz says it's a MSI-MS6577
Processor: Pentium 4 @ 2.53GHz
Power: Cheapo 250w
Video: 6600GT (@ AGP4x!)
Ram: 1024MB DDR333
Sound: Realtek onboard.
HDD: 1 internal 120GB, 1 external USB 250GB, 1 backup 500GB
*sigh* I need something new as the main PC.

MOBO: Asus M3A32-MVP
CPU: Athlon X2 6000+
RAM: Corsair 8GB (4*2GB) DDR2 8500
GFX: EVGA 8800GT
Sound: Asus Xonar DX2
Monitor: Benq 24" 241W
HDD: Seagate Barracuda 320GB * 2 (Raid 1)
DVD: Sony Optiarc DVD RW
PSU: Enermax Modu 82+ 625W
OS: Vista 64 Ultimate
Case: Cooler Master Stacker (Original version)
Mouse: Microsoft Wireless Intellimouse Explorer 2
Keyboard: Logitech Ultra X
Headphones: Sennheiser PC161