Improvements to build 2

I would go for this build:

PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i7-4770K 3.5GHz Quad-Core Processor ($334.97 @ SuperBiiz)
CPU Cooler: Noctua NH-U14S 55.0 CFM CPU Cooler ($59.99 @ NCIX US)
Thermal Compound: Arctic Silver 5 High-Density Polysynthetic Silver 3.5g Thermal Paste ($6.20 @ Outlet PC)
Motherboard: Gigabyte GA-Z87X-UD3H ATX LGA1150 Motherboard ($159.99 @ Newegg)
Memory: Patriot Intel Extreme Master, Limited Ed 8GB (2 x 4GB) DDR3-1866 Memory ($57.34 @ Amazon)
Storage: Seagate 4TB 3.5" 7200RPM Internal Hard Drive ($215.99 @ Mac Mall)
Video Card: Gigabyte GeForce GTX 760 2GB Video Card ($254.99 @ NCIX US)
Case: Corsair 500R Black ATX Mid Tower Case ($109.99 @ NCIX US)
Power Supply: SeaSonic M12II 850W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($109.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($18.48 @ Outlet PC)
Operating System: Microsoft Windows 8 (OEM) (64-bit) ($88.88 @ Outlet PC)
Keyboard: Corsair Vengeance K95 Wired Gaming Keyboard ($137.99 @ NCIX US)
Mouse: Logitech G500 Wired Laser Mouse ($49.99 @ Newegg)
Total: $1604.79
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-09-08 22:13 EDT-0400)