You can handle the wifi requirement with an add in card that goes in one of the available X1 slots. Pick one with an antenna to get better signal strength.
Do not use a USB wifi dongle, they are weak.
Your build is fine, but I have a few suggestions:
1. I7-6700K is as good as it gets.
But if your main purpose is for gaming, consider a $100 cheaper I5-6600K with an overclock.
Few games can use the hyperthreads of a I7.
As of 5/2016
What percent can get an overclock at a somewhat sane 1.40v Vcore.
I5-6600K
5.0 2%
4.9 11%
4.8 36%
4.7 64%
4.6 88%
I7-6700K
4.9 2%
4.8 17%
4.7 59%
4.6 93%
4.5 100%
2. NH-D15 is a great cooler, be aware that it is HUGE. 14nm skylake does not need top cooling in a well cooled case like yours.
I cool a I5-6600K@4.8 with a NH-U12s. Look for the newer s variants, they are designed for ram clearance and are offset a bit to clear a graphics card in the first pcie slot. NH-U14s would be optimum.
3. Love the ssd. For bulk storage, look to WD which seems to be more reliable. WD red is good.
4. GTX980ti is a very good card. But a GTX1070 will be stronger and cheaper. It also has newer architecture. Stick with EVGA as a brand.