I'm trying to figure out which CPU to get for an overclocked system running 2x gtx 1080 sli plus a custom water loop system plus bunch of other stuff.

mainly for gaming.

hesitating between i5 6600k vs i7 6700k
i5 7600k vs i7 7700k

or extreme processors
or even 6800k pr 6850k. bit confused about which to pick