Everyone else is recommending builds so:
PCPartPicker part list:
http://pcpartpicker.com/p/263sm
Price breakdown by merchant: http://pcpartpicker.com/p/263sm/by_merchant/
Benchmarks: http://pcpartpicker.com/p/263sm/benchmarks/
CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($196.99 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($32.98 @ SuperBiiz)
Motherboard: MSI Z77A-G45 ATX LGA1155 Motherboard ($79.99 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($59.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($58.99 @ NCIX US)
Video Card: MSI GeForce GTX 670 2GB Video Card ($249.99 @ Newegg)
Case: BitFenix Merc Alpha (Black) ATX Mid Tower Case ($39.99 @ NCIX US)
Power Supply: Corsair CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply ($64.99 @ Amazon)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($14.99 @ Newegg)
Total: $798.90
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-21 12:42 EST-0500)