main link-
http://pcpartpicker.com/p/IQJq
Here is the full link but the only difference is a 1tb hard drive @7200 rpm and an aftermarket cooler so the cpu will be a bit cooler ant the fan will be a bit quieter.
CPU: AMD Phenom II X4 955 Black 3.2GHz Quad-Core Processor ($91.00 @ NCIX US)
CPU Cooler: Zalman CNPS5X Performa CPU Cooler ($14.99 @ NCIX US)
Motherboard: Gigabyte GA-78LMT-USB3 Micro ATX AM3+ Motherboard ($54.99 @ Newegg)
Memory: Kingston Black 8GB (2 x 4GB) DDR3-1600 Memory ($36.99 @ NCIX US)
Storage: Western Digital Caviar Blue 750GB 3.5" 7200RPM Internal Hard Drive ($69.98 @ Outlet PC)
Video Card: Sapphire Radeon HD 7850 1GB Video Card ($154.99 @ Newegg)
Case: Zalman Z5 ATX Mid Tower Case ($24.99 @ Newegg)
Power Supply: Corsair Builder 430W 80 PLUS Bronze Certified ATX12V Power Supply ($34.99 @ Newegg)
Optical Drive: Samsung SH-224BB DVD/CD Writer ($15.99 @ Newegg)
Total: $498.91
(Prices include shipping, taxes, and discounts when available.)