Looks good to me.
If you want to go 4K a GTX1080Ti will handle all those pixels as long as you keep the settings within reason ( leave the AA 'AntiAliasing' ) at minimum, or off to start with, it hammers the framerate at lesser resolutions, at 4K it'll decimate them. Also, don't expect to play over 60FPS, few ( if any ) available monitors will go over that figure and without sacrificing a fair amount of eye candy the graphics card won't either.
If you plan on playing fast paced games though, I suggest you go for a 27" 2560x1440 144Hz display instead.
Personally, I'd opt for a IPS Freesync model, Gsync only really shines at low frame rates, once over 50 FPS there's very little difference apart from price. Just set the Vsync option in...