Yeah I've seen something floating around about using the trial version of windows 10, I'm not sure if there's any issues doing it like that though.
Swapping the mobo for the suggested MSI bazooka, and will decide on the case later on.
I've probably got caught up in the latest and greatest parts and not considering the other ones available that will work for what I need. I've got no intention of playing at 4k or 1440p, I'd just like a (mostly) stable 1080p at 60fps to be able to play some of the games I had on my Xbox before it died. The RX 480 is looking a bit overkill for my needs, and maybe the 470 is enough.
Regarding the image/video editing, hell, I can get by with doing that on the crappy dell laptop I'm using right now so it's hardly intensive production. The 6400 paired with 8GB RAM should be more than enough for that shouldn't it?