want to buy a new pc for gamming

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD Phenom II X4 965 Black 3.4GHz Quad-Core Processor ($92.13 @ TigerDirect)
Motherboard: MSI 760GM-P34(FX) Micro ATX AM3+ Motherboard ($54.98 @ SuperBiiz)
Memory: Kingston HyperX Grey 8GB (2 x 4GB) DDR3-1600 Memory ($63.21 @ Amazon)
Video Card: Gigabyte Radeon HD 7850 2GB Video Card ($165.38 @ Newegg)
Case: Thermaltake VL80001W2Z ATX Mid Tower Case ($21.99 @ Microcenter)
Power Supply: Corsair Builder 500W 80 PLUS Certified ATX12V Power Supply ($44.99 @ Microcenter)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($16.98 @ Outlet PC)
Total: $459.66
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-09 10:30 EDT-0400)