If you do build, this is what I would go with, you could drop down to an pentium or i3 and a 260x, and if room in the budget I would get a 128 GB SSD for windows
PCPartPicker part list:
http://pcpartpicker.com/p/MvMvsY
Price breakdown by merchant: http://pcpartpicker.com/p/MvMvsY/by_merchant/
CPU: Intel Core i5-4590 3.3GHz Quad-Core Processor ($199.99 @ Newegg)
Motherboard: ASRock H97 PERFORMANCE ATX LGA1150 Motherboard ($74.99 @ Newegg)
Memory: G.Skill Ripjaws Series 8GB (2 x 4GB) DDR3-1600 Memory ($72.00 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($53.99 @ Amazon)
Video Card: XFX Radeon R7 265 2GB Video Card ($107.50 @ Newegg)
Case: Corsair SPEC-01 RED ATX Mid Tower Case ($44.99 @ Newegg)
Power Supply: Antec HCG M 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($64.99 @ Newegg)
Optical Drive: Lite-On iHAS124-14 DVD/CD Writer ($12.99 @ Newegg)
Total: $631.44
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-09-08 00:12 EDT-0400