It's all good. The only remark is that XFX pro550w is not officially compatible with haswell C-states. You will have to disable them in BIOS. Read more: http://xfxforce.com/pt-br/Features/haswell-compatibilit...
I'd made a few adjustments:
I don't know why you decided on (mATX) Gryphon board. I choose a cheaper one (ATX).
GTX760 is faster and cheaper than HD7950.
With saved money, I replaced your Sandisk Readycache with a real SSD.
PCPartPicker part list / Price breakdown by merchant / Benchmarks
CPU: Intel Core i5-4670K 3.4GHz Quad-Core Processor ($199.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.99 @ Microcenter)
Motherboard: ASRock Z87 Extreme4 ATX LGA1150 Motherboard ($147.86 @ Newegg)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($74.99 @ Newegg)
Storage: Kingston SSDNow V200 Series 64GB 2.5" Solid State Disk ($52.99 @ Newegg)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($62.99 @ Amazon)
Video Card: Gigabyte GeForce GTX 760 2GB Video Card ($259.99 @ Amazon)
Case: Cooler Master Storm Enforcer ATX Mid Tower Case ($59.99 @ Newegg)
Power Supply: XFX 550W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($29.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($17.98 @ Outlet PC)
Total: $936.76
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-08-14 04:33 EDT-0400)