I'm not sure the H115i will fit in the case but it looks good.
What about WiFi? I'm guessing I'll need a seperate card for that right?
It's been a while since I built a pc
It SHOULD fit in the case. It can hold up to 360mm radiators Front mounted only and 240mm Top and Front. The real question will come down to clearance for your GFX card. It's a longboard you maybe might possibly have issues with clearance. The specs on the cases usually list that kind of info.
"GPU max length 315 mm with front fan mounted" - from FractalDesign.com
As for WiFi, that's a whole topic. From my experience with Hackintosh, and based on the build I'm currently running, here's my recommendation. Take this with a grain of salt.
Grab a motherboard that has a m.2 Type E key slot on it. It it comes with a wifi chip in the m.2 E-Key, awesome.
Find and order a DW1830 WiFi/BT chip online for like $25. Sell the one that it came with and make back that $25.
Drop the DW1830 in the slot and you're off to the races. The Wifi on the DW1830 is natively supported in OS X so you don't have to fiddle too much. Just be sure that when you do order the DW1830 you also grab a couple wire antennas that you can run from your case to either the antenna sockets on the motherboard backplate, or internal antennas to run along the inside of your case. There should be three, two for WiFi and one for BlueTooth.
Wifi on the DW1830s is natively supported so you'll be up and running in no time. Bluetooth might take a some digital jiggly-wiggly voodoo kexting magic to get working, but once you get it, you'll be golden.
In the forums you'll also find about 7234597459834598723498751 threads and posts regarding WiFi (that is an exact number). Start here >>>
Network<<<.