Can you go $385? Eventually this one can even overclock.
PCPartPicker part list:
http://pcpartpicker.com/p/1BNmX
Price breakdown by merchant: http://pcpartpicker.com/p/1BNmX/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1BNmX/benchmarks/
CPU: AMD Athlon II X4 750K 3.4GHz Quad-Core Processor ($79.99 @ Amazon)
Motherboard: ASRock FM2A85X Extreme4 ATX FM2 Motherboard ($79.99 @ Newegg)
Memory: Crucial Ballistix 4GB (2 x 2GB) DDR3-1600 Memory ($30.83 @ NCIX US)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ Outlet PC)
Video Card: MSI Radeon HD 7770 GHz Edition 1GB Video Card ($69.99 @ Newegg)
Case: Antec VSK-4000 ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($34.99 @ Newegg)
Total: $385.76
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-09 12:33 EDT-0400)