Amar seems like a great kid and great teammate. If he chooses to be an end of the bench player who gets burn when the front line gets in foul trouble, so be it. If he chooses to explore an option where he is guaranteed more PT, best of luck.
Bottom line is that if we bring in one immediately eligible transfer big, the front line will be a combination of that player, Owens, Yawke and Clark. In theory, that should be fine, if Clark is solid, the transfer is solid, and Yawke/Owens continue to develop (realize Yawke is a wild card, because we expected him to develop more between years 1 and 2, as opposed to regressing, but he has tools and we have seen what maturation does for players).
Those 4, with Ahmed filling in sparingly at the 4, should be fine, coupled with Lovett, Ponds, Simon, Mussini and Freudenberg. That gives us 10 guys who can play in the rotation, and at least 9 if you assume Freudenberg doesn't progress at all.
I don't see more than one immediate transfer big, unless we really like a second kid and are fortunate to land him. Other transfer may be a "sit and wait a year" scenario, perhaps at the guard position for sure.