Alrighty then. I got you a list ma man. This setup will run an game out now smoothly at a super low price. Heres the components.
Motherboard
ASUS M5A97 AMD9 series ($90)
CPU
AMD PhenomII X4 965 Black edition. ($120)
RAM
Crucial 4GB DDR3 (1333 Mhz) ($20)
Video Card
EVGA GeForce GTX 550 Ti Superclocked (1GB) ($125)
Hard Drive
Western Digital Caviar Blue 500 GB ($75)
Optical Drive
Lite-on Internet DVD Writer ($1
Case
Cooler Master RC-430-KWN1 Elite 430 ($50)
Power Supply
Cooler Master Elite series 400 watts ($40)
Overall, this should run you about $538.
(just use google to find the stuff)
((if you want more power, Ive got another list here for a mid range computer, lemme know))