I would get the 850 G2 from EVGA instead, for the headroom. Overall it's a great build, and would recommend the Z97 board as said above as well. I would also get a pair of Corsair SP-120s to replace the stock ones on the H100i, as the stock ones are quite loud at load.
Don't get the SP120s for the rest of the case. Get the SP 120s for the radiator, and AF120s for the case fans.
And that makes sense, I understand the aesthetic part lol the UD4H is a good board. Just make sure to ask whoever you're buying from that it has the latest BIOS installed so your 4790k will work out of the box without a BIOS flash needed.
Yeah, as long as it comes shipped with the F9 version of the BIOS it'll run the 4790k. I would just verify that with them before they ship it to you, as if it isn't up to date, you would need a supported CPU to even flash the BIOS.