i say do ioa n us, because disney world is more for kids then any thing else,
also stay away from legoland or sea orld, as they both are rip offs.
and for spending money, bring alot since food here cost more then it would else where,
you could do 2 days at disney and one day at univers n ioa, but if you are looking for rides with theme, look at ioa n u.s.f