From what I can tell, if it were me I'd say an intel kaby lake core i5, and a gtx 1080ti, if you're looking at a higher end (1200-1600$) 2k or 4k build For 1080p, a 1070, rx480, or similar, with a skylake i5 (sub 1000$)
For ridiculousness, a 10 core intel skylake cpu (should come out next year)...