By my estimation, some of the parts are unnecessarily expensive, but there's definitely nothing wrong with any of them.
1. I would probably opt for DDR3 1866 or 2133, unless there's no premium on the 2400, as there is virtually no performance difference with faster RAM on Haswell, except in a few specific applications. Faster RAM won't hurt, but there's not a lot of value in it.
2. The only advantages I can see over a
$90 motherboard are improved shielding of sound circuitry, and beefier power delivery. The latter doesn't seem all that useful to me, as Haswell has never really been limited in overclocking potential when not under LN2 (and perhaps not even then).
This $120 board has USB3.1, which your chosen board does not.
3. SeaSonic has a well-deserved reputation for building solid and reliable power supplies, but if I were buying for myself, I'd probably go with something like
this $65 Antec 550w which has a higher efficiency rating and half the cost, or perhaps
this $95 650w. Dual 970's and a 4790K should work nicely with a 550w unit with some power to spare. Your system, as configured, probably doesn't draw more than around 250w.
4. You might consider a tower cooler rather than an AIO water solution, as the pumps in AIO's have a reputation for being rather noisy. I would likely only consider an AIO in a small form factor case, where a tower cooler would make it obnoxious to access ports and such on the motherboard. The Hyper212 EVO is often considered one of the best values in tower coolers (excluding sales) and comes in around $30, while Noctua's higher-end offerings tend to take the absolute performance crown. Noctua's tower heat sinks will probably be more expensive than the Corsair unit you picked out, but I ran watercooling for more than 12 years and am tired of dead pumps and leaks, and now advise people to avoid unnecessary complexity.
5. Arctic Silver 5 is still a fine thermal paste, but there are stronger offerings on the market now. You might consider IC7 Diamond instead.
That said, I'm sure you'd have no regrets, other than cost, with your selected parts (other than *possibly* the cooler).
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