CPU: AMD Athlon II X4 640 3.0GHz Quad-Core Processor
($74.24 @ Amazon) Motherboard: Gigabyte GA-78LMT-S2P Micro ATX AM3+ Motherboard
($46.98 @ Outlet PC) Memory: Patriot Signature 8GB (2 x 4GB) DDR3-1600 Memory
($49.99 @ Amazon) Case: Cooler Master Elite 430 ATX Mid Tower Case
($29.99 @ Newegg) Optical Drive: Lite-On iHAS124-04 DVD/CD Writer
($17.98 @ Outlet PC) Total:
$219.18(Prices include shipping, taxes, and discounts when available.)
Quad-core CPU, 8GB of RAM... its a half decent budget build that will be able to do moderate gaming just fine. My bro has a very similar setup and runs Battlefield 3 on high settings. The only question is, do you need an OS? Because you are looking at a another $90 for Windows 7.