PCPartPicker part list:
http://pcpartpicker.com/p/1s4hu
Price breakdown by merchant: http://pcpartpicker.com/p/1s4hu/by_merchant/
Benchmarks: http://pcpartpicker.com/p/1s4hu/benchmarks/
CPU: Intel Pentium G2020 2.9GHz Dual-Core Processor ($61.98 @ Outlet PC)
Motherboard: MSI B75MA-P33 Micro ATX LGA1155 Motherboard ($58.29 @ NCIX US)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($56.99 @ Newegg)
Storage: Toshiba 500GB 3.5" 7200RPM Internal Hard Drive ($49.99 @ Newegg)
Video Card: MSI Radeon HD 7770 GHz Edition 1GB Video Card ($69.99 @ Newegg)
Case: Thermaltake VL80001W2Z ATX Mid Tower Case ($21.99 @ Microcenter)
Power Supply: Corsair Builder 500W 80 PLUS Certified ATX12V Power Supply ($29.99 @ Newegg)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Total: $444.19
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-08-14 21:41 EDT-0400)
You get one free game with the 7770 ghz. Never Settle forever Bronze choices are Sleeping Dogs, Deus Ex: Human Revolution, Far Cry 3, Far Cry 3: Blood Dragon, Dirt 3 or Dirt Showdown.
This has 75 dollars worth of rebates before final price and does not have tax.
I think this will take care of your needs if you have a monitor and peripherals.
You could lower ram to 4gb to shave 20 to 30 bucks off.