I don't know, it would depend a lot on how much improved is Big Baby and on whether the intention is to keep him or Powe (and, of course, on the Miles situation).
Kleiza would be a fine addition to our roster, I think, because he can guard the bigger SFs, especially shooting specialists, who will give TA problems and the later would guard the quicker ones that Kleiza can't stop. He's also able to score in bunches when hot and is always a threat from the outside (otoh, he can also shoot you out of a game, so Doc would need to manage his playing time the same way he managed Powe's).
I'd do a Scal+Pruitt+ Powe or BBD depending on who we want to keep for Kleiza+Hunter. No 1st round pick, though (that we don't have, anyway). TP for an intriguing trade proposal.