Id say miami as the most obvious choice depending on who if anyone leaves. Well talked about management and gm, free flowing 3 pt shooting offense + small ball where he'd start at the 4, seemingly strong team camaraderie and cohesiveness, and lebron outside of his nose is as durable and injury free as u could hope for in a teammate.
Chicago would be just as good a choice but the derrick rose qiestion mark, the behind the scenes rumbling between management and first rose, then deng, and their coach's style of play and practice.. makes them a little riskier a choice imo.
Not sure how realistic it is but Houston would be similar to miami in that it seems high on morale and matching style of play.. but i dont think the cohesiveness would be nearly as smooth as houston can get pretty erratic/undisciplined with their decision making