He said $400-500.
PCPartPicker part list:
http://pcpartpicker.com/p/KkHZ6h
Price breakdown by merchant: http://pcpartpicker.com/p/KkHZ6h/by_merchant/
CPU: AMD Athlon X4 860K 3.7GHz Quad-Core Processor ($68.89 @ OutletPC)
Motherboard: Gigabyte GA-F2A88XM-D3H Micro ATX FM2+ Motherboard ($58.89 @ OutletPC)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory ($29.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($49.98 @ OutletPC)
Video Card: EVGA GeForce GTX 750 Ti 2GB Superclocked Video Card ($99.99 @ Newegg)
Case: Corsair SPEC-01 RED ATX Mid Tower Case ($34.99 @ Micro Center)
Power Supply: SeaSonic S12II 520W 80+ Bronze Certified ATX Power Supply ($50.99 @ SuperBiiz)
Operating System: Microsoft Windows 10 Home OEM (64-bit) ($87.95 @ OutletPC)
Total: $481.67
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2016-01-18 15:12 EST-0500
If you don't need an OS i would grab a GTX 760