A little bit more than yours.
Faster RAM
MUCH better CPU cooler that is quiet. The Corsair H100 is NOT quiet at all. But it could fit, the Noctua I added though is just as good as the H100.
PSU is cheaper, better quality though.
PCPartPicker part list:
http://pcpartpicker.com/p/3EYhh
Price breakdown by merchant: http://pcpartpicker.com/p/3EYhh/by_merchant/
Benchmarks: http://pcpartpicker.com/p/3EYhh/benchmarks/
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($234.97 @ OutletPC)
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler ($78.99 @ Newegg)
Motherboard: MSI Z87-G45 Gaming ATX LGA1150 Motherboard ($126.98 @ SuperBiiz)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-1866 Memory ($79.99 @ Newegg)
Storage: Samsung 840 EVO 120GB 2.5" Solid State Disk ($79.99 @ Micro Center)
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive ($83.98 @ Amazon)
Video Card: Asus GeForce GTX 770 2GB DirectCU II Video Card ($319.99 @ NCIX US)
Case: Fractal Design Define R4 w/Window (Black Pearl) ATX Mid Tower Case ($89.99 @ Newegg)
Power Supply: Antec High Current Gamer 620W 80+ Bronze Certified Semi-Modular ATX Power Supply ($87.24 @ Amazon)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($16.99 @ Newegg)
Operating System: Microsoft Windows 8.1 (OEM) (64-bit) ($89.98 @ OutletPC)
Total: $1278.09
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-05-06 11:32 EDT-0400)