I would change a couple things.
- Replace the dominator platinums as they are super expensive. Get 8GB (2x4GB) 1600/1866MHz kit. I prefer G Skill, Corsair and Mushkin. Kingston, Patriot and Crucial are good as well. 16GB is overkill for games because even 4GB is still enough.
- Get an OCZ Vertex 4/Samsung 840 PRO 120GB for the boot drive and if you can afford another SSD, get a crucial M4 512GB for your games (just a recommendation).
- The 7970 is good but it uses the reference design cooler. It's probably better because you're getting a Fractal Design R4 though so no need to change anything it seems. Just remember that gpu overclocking will be more limited on this card though.
- 750W is overkill for this config. Get a 600W-650W psu like the corsair HX650 or Seasonic 660XP (one of the best unit available.)