$1800 PC for streaming? Nah bruh, get a Shield TV or some HDMI streaming stick instead.
Here's a whole Android mini computer for $100, would also work:
https://www.amazon.com/dp/B00RGMI3TU/ref=psdc_13447451_t4_B01I7DCLYO
yeah Shield TV would get my vote, I have a PC in my living room and it works fantastic for emulation stuff even better than a Shield TV (that I have in my bedroom) but legit I fire up my Shield TV probably 10 times as much as the PC in my living room... (I do have my other PC in my bedroom running pretty much 24/7 though)
For Kodi get a Shield TV, out of all the devices I have used it on that one is far and away the best with it. Now for streaming of other stuff? Netlix is best so far on Shield TV (I am getting an Apple TV 4K in like a week so I will see how that works...) Roku channel is best on Roku of course lol and if you want stuff like Spectrum streaming cable or Amazon (Amazon is about the same on Roku or Shield TV) or Direct TV Now, you need anything but Android For some reason the cable TV offerings on Android are either buggy or barely work (with the things I have on hand)
But yeah rather than spend 1800 on a PC to connect to a TV (its not as great as it sounds... reading text is a pain and that's a lot of the whole PC experience.) I would get a Shield TV and a Roku Express Plus, those two will give you access to like 99% of the streaming stuff out there.
If you prepay for 3 months of Direct TV Now you get a free Apple TV 4K for $115 (after taxes and stuff)