First System Build gaming pc help

I see that you want to keep a budget, but what do you want to do with it? How much are you willing to spend?

my budget is 500-600 and used for gaming specifically.

I think you'll find that this build is much better suited to your needs as a gamer.

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Newegg)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.99 @ Microcenter)
Motherboard: Gigabyte GA-78LMT-USB3 Micro ATX AM3+ Motherboard ($49.99 @ Microcenter)
Memory: Crucial Ballistix 8GB (2 x 4GB) DDR3-1600 Memory ($59.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.99 @ Microcenter)
Video Card: PowerColor Radeon HD 7870 XT 2GB Video Card ($163.98 @ Newegg)
Case: Thermaltake VL80001W2Z ATX Mid Tower Case ($24.99 @ Microcenter)
Power Supply: Corsair CX 500W 80 PLUS Bronze Certified ATX12V Power Supply ($39.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.99 @ Newegg)
Total: $555.90
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-10-31 19:54 EDT-0400)

with the os that would push it pass 600, my built above included win 7, maybe get a cheaper gpu?