PCPartPicker part list:
http://pcpartpicker.com/p/22Hfr
Price breakdown by merchant: http://pcpartpicker.com/p/22Hfr/by_merchant/
Benchmarks: http://pcpartpicker.com/p/22Hfr/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($225.99 @ NCIX US)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Asus Maximus VI Hero ATX LGA1150 Motherboard ($189.99 @ NCIX US)
Memory: Corsair Vengeance LP 8GB (2 x 4GB) DDR3-1866 Memory ($89.99 @ Amazon)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($99.00 @ Amazon)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: EVGA GeForce GTX 780 3GB Video Card ($514.99 @ SuperBiiz)
Case: Corsair 500R White ATX Mid Tower Case ($69.99 @ Newegg)
Power Supply: Corsair 860W 80+ Platinum Certified Fully-Modular ATX Power Supply ($149.99 @ Newegg)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.00 @ Amazon)
Total: $1518.90
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-15 10:19 EST-0500)
Even including an OS, and has a PSU that will allow you to SLI. If you don't plan on adding a second GPU, then you could save even more money by swapping out the PSU with a 650W one. You could also swap out the case for whichever one you prefer.