Make sure the PSU will fit in the case. I once bought a 1200 Watt PSU and had to get the hacksaw out:doh:
Also check out if that cooler is going to be good enough. I have a custom loop and I prefer the bespoke path. It has 360 rad and a D5 vario with dualbay resevoir and a XSPC block, keeping my 8600k @60C under load @5.2Ghz Well worth considering for such a nice rig, it does not look as though your skimping on any of the components
Also the 1080Ti will be more future proof than the 1080 though the 1080 is an amazing card :thumbup:
PS welcome to the forums :)