With the extra 100 bucks you can either get an i7 or a better cooler and mobo, but I think this build like this is good enough for any game out there.
PCPartPicker part list:
http://pcpartpicker.com/p/CcDCqs
Price breakdown by merchant: http://pcpartpicker.com/p/CcDCqs/by_merchant/
CPU: Intel Core i5-4690K 3.5GHz Quad-Core Processor ($218.98 @ OutletPC)
CPU Cooler: Corsair H50 57.0 CFM Liquid CPU Cooler ($49.98 @ OutletPC)
Motherboard: Asus Z87-A ATX LGA1150 Motherboard ($79.99 @ NCIX US)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($72.98 @ OutletPC)
Video Card: MSI GeForce GTX 970 4GB Twin Frozr V Video Card ($348.95 @ Amazon)
Case: Fractal Design Define R4 (Black Pearl) ATX Mid Tower Case ($79.99 @ NCIX US)
Power Supply: SeaSonic 620W 80+ Bronze Certified Fully-Modular ATX Power Supply ($54.99 @ Amazon)
Total: $905.86
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-01-09 19:12 EST-0500