PCPartPicker part list:
http://pcpartpicker.com/p/35WeG
Price breakdown by merchant: http://pcpartpicker.com/p/35WeG/by_merchant/
Benchmarks: http://pcpartpicker.com/p/35WeG/benchmarks/
CPU: AMD Athlon X4 750K 3.4GHz Quad-Core Processor ($79.98 @ OutletPC)
Motherboard: Asus A55BM-E Micro ATX FM2+ Motherboard ($49.99 @ Microcenter)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1600 Memory ($69.99 @ Newegg)
Storage: Hitachi Ultrastar 1TB 3.5" 7200RPM Internal Hard Drive ($49.50 @ Amazon)
Video Card: XFX Radeon R7 260X 2GB Video Card ($125.98 @ SuperBiiz)
Case: Corsair 200R ATX Mid Tower Case ($49.99 @ Newegg)
Power Supply: Corsair Gaming 600W 80+ Bronze Certified ATX Power Supply ($69.99 @ Microcenter)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer ($16.98 @ OutletPC)
Total: $512.40
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-03-07 18:57 EST-0500)