I also recently built a gaming system that is working wonderfully with Halo, Call of Duty 4 Modern warfare as well as many others. I purchased everything at these two places online,http://www.tigerdirect.com/http://www.newegg.com/
I only spent around 4 or 500$ and it's a screamer (by my standards).It was simple to assemble and I have yet to find a game it won't run.
Here's what I built,
328 SILVER ATX MID TOWER COMPUTER CASE w/ 420w PS
ECS AMD690GM-M2 AM2 AMD 690G Micro ATX AMD Motherboard
AMD Athlon 64 X2 4000+ Brisbane 2.1GHz 2 x 512KB L2 Cache Socket AM2 65W Dual-Core Processor - OEM
OCZ Platinum Revision-2 2048MB PC6400 DDR2 800MHz Dual Channel Memory (2 x 1024MB)
ThermalTake TMG A3
CPU Cooling Fan for AMD AM2/K8
Samsung 200GB SERIAL ATA HD 7200/8MB/SATA-3G
WD Caviar 80GB SATA-3G HD 7200/8MB/SATA-3G
NVIDIA GeForce 8500 GT 256MB PCIe w/DVI/TV-OUT
Lite-ON 20X DVDRW SATA LH-20A1S-12 Int No SW OEM
SAMSUNG Black 20X DVD+R 8X DVD+RW 16X DVD+R DL 20X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA 20X DVD±R DVD Burner with LightScribe - OEM
Rosewill RCR-102 52-in-1 USB 2.0 Card Reader
TP-Link TL-WN651G Wireless G Network Adapter - 108Mbps, 802.11g, PCI
Leadtek WinFast HDTV Cinema PCI TV Tuner - ATSC, NTSC, DVR, All-in-1 Remote, Video Converter, EPG, Direct Burn-to-Disc, iPod/PSP Support
Logitech USB cordless keyboard and mouse
The only thing I didn't replace was my monitor.
P.S. I would recommend a different MOBO though since ECS isn't the most reliable company in the world. Maybe instead try this MOBO, MSI K9AG Neo2-Digital AMD 690G Socket AM2 Motherboard.
Edited by zedsed420, 13 April 2008 - 01:15 PM.
Asus Crosshair III Motherboard, AMD PhenomII x4 965 custom watercooled XSPC Raystorm copper block, 8g Mushkin Blackline
2 XFX Radeon 4890's in Crossfire mode custom watercooled full copper EK blocks, XSPC rs360 triple 120 radiator
850w Antec full modular 80plus certified, NZXT Switch Black case Custom Watercooled Laing DDC w/ XSPC pumptop res
Tygon black tubing, all Bitspower fittings and clamps, 2 Samsung 1T spinpoint F1's
Windows 7 Professional x64 dual boot Ubuntu 12.10