at the very least hes going to be an elite post defender, and an athletic big who can finish around the basket. a frontline of tristan drummond would be extremely effective defensively (but also very anemic on offense, unless tt or drummond improve on the offensive end, which there is a decent probability of happening). this would also allow av and tt to move back to their natural power forward position. TT, varejao, drummond... damn that would probably be one of the best defensive front courts in the entire league.
or the cavs could take beal and solidify our back court for the (hopefully) next decade. either one id be happy with, and both are major positions of need.
heres something to consider: if drummond sucks, then the cavs will be awful next year as well, giving them another shot at a top 5 pick. if we get beal, i think the cavs could be a fringe playoff team. the improvement from parker to beal is tremendous.
thats assuming mkg or davis isnt available, those are my two favorites.