Heres a good build;
http://pcpartpicker.com/p/B5Vc
CPU
AMD FX-8120 3.1GHz 8-Core Processor $158.97 FREE $158.97 Outlet PC Buy
CPU Cooler
Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler $33.24 FREE $33.24 Amazon Buy
Motherboard
Gigabyte GA-78LMT-USB3 Micro ATX AM3+ Motherboard $59.99 $59.99 Microcenter Buy
Memory
PNY Optima 4GB (1 x 4GB) DDR3-1333 Memory $14.99 FREE $14.99 Amazon Buy
Storage
Samsung Spinpoint F3 EG 1TB 3.5" 5400RPM Internal Hard Drive $59.88 $59.88 Outlet PC Buy
A-Data Premier Pro SP600 32GB 2.5" Solid State Disk $44.98 $44.98 Outlet PC Buy
Video Card
HIS Radeon HD 6670 2GB Video Card $69.98 $69.98 Outlet PC Buy
Case
Silverstone PS08B (Black) MicroATX Mid Tower Case $34.90 FREE $34.90 Amazon Buy
Power Supply
Cooler Master eXtreme Power Plus 500W ATX12V Power Supply $44.99 -$10.00 FREE $34.99 Newegg Buy
$10.00 mail-in rebate
Optical Drive
Lite-On iHAS124-04 DVD/CD Writer $16.98 $16.98 Outlet PC Buy
Operating System Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) $89.98 $89.98 Outlet PC Buy
Base Total: $628.88
Mail-in Rebates: -$10.00
Total: $618.88