Here's what I recommend you for that budget :
PCPartPicker part list:
http://pcpartpicker.com/p/2ROn4
Price breakdown by merchant: http://pcpartpicker.com/p/2ROn4/by_merchant/
Benchmarks: http://pcpartpicker.com/p/2ROn4/benchmarks/
CPU: AMD Athlon X4 750K 3.4GHz Quad-Core Processor ($79.98 @ OutletPC)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: MSI FM2-A75MA-E35 Micro ATX FM2 Motherboard ($57.78 @ Newegg)
Memory: A-Data XPG V2 8GB (2 x 4GB) DDR3-1600 Memory ($69.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($64.99 @ Newegg)
Video Card: EVGA GeForce GTX 660 2GB Video Card ($179.99 @ NCIX US)
Case: Rosewill Galaxy-03 ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: Rosewill Hive 650W 80+ Bronze Certified Semi-Modular ATX Power Supply ($49.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)
Total: $562.68
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-02-12 01:54 EST-0500)