Lots of things need changed.
1) I5-4690K is already 2 generations old, quite soon to be 3 generations old. It's recommended to get modern day hardware instead, so an I5-6600K (or even an I5-6500 is perfectly fine).
2) With that the motherboard and RAM need changed for compatibility. If getting the I5-6600K, get a Z170 motherboard. If getting the I5-6500, get an H110 or H170 motherboard. The I5-6500 should save you a good deal of money without hurting your performance, so it could save you money. The RAM need sto be DDR4 memory. Just get 2x8GB, don't buy sticks in separate packs, there is no guarantee they will work.
3) I'd recommend a different PSU such as the Seasonic G Series 550W, Corsair RM550x, or EVGA 550 G2. The NEX 750B has never been reviewed by a professional, so it's assumed to be poor since the next-step-up, thew NEX G series, is not too good. So get a better PSU.
4) The extra fans are probably unnecessary. They also state they have a "hydraulic bearing" which is usually fancy codename for a sleeve bearing, to my knowledge. If you plan to mount these fans flat, I'd recommend getting ball bearing fans to reduce noise and vibration.
5) get a larger SSD like the Samsung 850 EVO 250GB
6) Windows 10? Not sure why you'd get 8. Don't listen to all the "Windows 10 sucks" stuff.