Building my first gaming PC, need advice!

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A very nice build.
From a compatibility point of view, I see no problems.
I might do some things a bit differently:

1. Few games will use more than 2-3 cores, making the hyperthreads of the 4770K a bit useless.
I might use a 4670K instead.
If the $100 delta is not a bother, you will get a slightly better binned chip with the 4770K.

2. The R9 cards are currently overpriced because of the bitcoin mining mania.
I would use the equivalently performing GTX770 cards instead. Nvidia drivers have generally had fewer multigpu lagging issues.

3. Unless you are planning on triple monitor gaming or a 4k monitor, I would use a stronger single card instead.
Look at a single GTX780ti. You may not win FPS benchmarks, but your gameplay will be smoother with less screen tearing.

4. I do not much like all in one liquid coolers when a good air cooler can do the job.
A liquid cooler will be expensive, noisy, less reliable, and will not cool any better
in a well ventilated case.
Liquid cooling is really air cooling, it just puts the heat exchange in a different place.
The orientation of the radiator will cause a problem.
If you orient it to take in cool air from the outside, you will cool the cpu better, but the hot air then circulates inside the case heating up the graphics card and motherboard.
If you orient it to exhaust(which I think is better) , then your cpu cooling will be less effective because it uses pre heated case air.
And... I have read too many tales of woe when a liquid cooler leaks.
google "H100 leak"

I would use a noctua or Phanteks air cooler with 140mm fans.
You will cool equally well, and be quieter in the process.

5. No game will, by itself use more than 2-3gb. But, I like 16gb.
Windows will keep more code in ram, available for instant reuse. Haswell does not depend on fast ram for performance. I might go with a low profile 1866 speed 1.5v ram. Chase lower latency instead of speed.
Read this: http://www.anandtech.com/show/7364/memory-scaling-on-haswell

6. Is there some feature of windows pro that you need? Most do not need more than home premium.