I am trying to build a gaming PC for about $600

An i3 build would be MUCH better.

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i3-4150 3.5GHz Dual-Core Processor ($104.88 @ OutletPC)
Motherboard: ASRock H97M Anniversary Micro ATX LGA1150 Motherboard ($68.98 @ OutletPC)
Memory: Crucial Ballistix Sport 8GB (2 x 4GB) DDR3-1600 Memory ($64.97 @ OutletPC)
Storage: Hitachi Ultrastar 1TB 3.5" 7200RPM Internal Hard Drive ($48.00 @ Amazon)
Video Card: XFX Radeon R9 280 3GB Double Dissipation Video Card ($152.99 @ NCIX US)
Case: Azza SIRIUS ATX Mid Tower Case ($44.99 @ Amazon)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply ($49.99 @ NCIX US)
Operating System: Microsoft Windows 8.1 - 64-bit (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $624.78
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-01-30 19:33 EST-0500

Better PSU and better CPU. Same price before rebates.
 
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