You can buy a motherboard with Wi-Fi built in I think, but it's not common. Also, if I could suggest a change, I would get a case that mounts the motherboard on a 90 degree rotation from the normal cases.
It lets heat vent out the top, since hot air rises.
That's what I'm using for the last two years, and I fucking love it. It's also worth looking into one of the corsair self contained liquid cooling elements for your CPU. Do you have a max budget?
Sent from my Galaxy Note 10.1