Some good ideas here. I'd like to have Gortat or someone like him—a good rebounder and shot blocker who's great at finishing around the rim. Someone suggested Monroe; I like that idea too.
If JCraw keeps developing like he has been, becoming an excellent, consistent shooter who can also pass pretty well, I can see a great three-guard rotation of him, Rondo, and AB, as Kozlodoev mentioned.
I also like the idea of a Sully/Olynyk/Player X/Fav big-man rotation (or maybe trade one of our current three or Bass to get that Player X). Have Green start at the 3, with Lee as the fourth guard/small-ball 3.
Of course, any of our draft picks could become the 2 or 5 of the future, or our backup 3. But I really like most of the guys we have now, and can see many of them becoming solid, if not great, players.