I'd voted for Bogut, I don't need him to do much, I need him to be what he was to GSW. The guy who just do all the dirty work, set hard hard picks, also very tough. An upgrade over Amir, and hopefully a player who can help Horford play the PF position (someone correct me if I am wrong but I think Horford once said he prefers playing the PF and not the C position).
I think he might come cheaper than the other players listed, without us giving up too much