Zoya Mist

Sorry for the delay.  I personally use the TP-Link AV2000.  My only complaint is how bulky they are, but with the performance I get out of them, that complaint is minimal.  They are a little pricey, I got them during a black friday sale last year sometime for less than they are now. 
 
https://www.amazon.com/TP-Link-Powerline-Pass-Through-TL-PA9020P-KIT/dp/B01H74VKZU/ref=sr_1_3?ie=UTF8&qid=1543506670&sr=8-3&keywords=tp-link+av2000
 
Also good to keep in mind.  YMMV since there are so many factors with powerline.  I purchased mine knowing that under best case scenario it could handle the throughput I was wanting plus a fair percent more. 

Tossing in my hat for powerline adapter if your house has semi newer cabling and you get a decent set of adapters.  I use a pair for my living room hardware and have zero issues. 
 
If you are determined to use wireless, a PCIe card with antennas would probably be best.  A USB dongle *can* have subpar throughput depending on which type of USB interface it uses (2.0 vs 3.0 etc).  Of course I say this with relativity and large grains of salt implied.

Yep, 1080s go for around 350, so that's not bad at all (looks over at 1070 Ti I got for $350)

Something such as the i5 6500 with a decent H170/B150 motherboard should work nicely.

i5 6500 and any h170 motherboard?