Alrighty then, I'll give the old gaming PC a shot:
CPU:
Intel Core 2 Duo E7400 Processor 2.8GHz $120
Motherboard:
Gigabyte EG41MF-S2H Motherboard $100
Memory:
OCZ Dual Channel 4GB PC6400 $50
Hard Drive:
Western Digital Caviar SE16 640GB Hard Drive $70
Graphics:
Radeon HD 4870 Turbo $250
Case:
Apevia X-Qboii Blue Micro ATX Case $80 (I like blue)
Disc Drive:
Lite-On DH-4B1S Serial ATA Interface Blu-ray Disc Writer $200
Total: $1140
This theoretically should do the trick with anything from CoD Modern Warfare 2 to that new Resident Evil.