I changed a few things. Here's what I recommend you :
PCPartPicker part list:
http://pcpartpicker.com/p/2Pe50
Price breakdown by merchant: http://pcpartpicker.com/p/2Pe50/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2Pe50/benchmarks/
CPU: AMD Athlon II X4 750K 3.4GHz Quad-Core Processor ($79.98 @ OutletPC)
Motherboard: Asus A55BM-E Micro ATX FM2+ Motherboard ($47.99 @ Newegg)
Memory: A-Data XPG V1.0 8GB (2 x 4GB) DDR3-1600 Memory ($69.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.66 @ OutletPC)
Video Card: Gigabyte Radeon R7 260X 1GB Video Card ($127.27 @ TigerDirect)
Case: Cougar Solution (Black) ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: Corsair Builder 500W 80+ Bronze Certified ATX Power Supply ($39.99 @ Newegg)
Optical Drive: LG GH24NSB0 DVD/CD Writer ($15.99 @ Microcenter)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($84.99 @ NCIX US)
Total: $555.85
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-07 21:43 EST-0500)