I think most of them need a refurb of some kind, like Indiana Jones SS, which is a great show, but has been the same show for nearly twenty years.
I would LOVE more (and much better) AA's in PPF and SWSA, because cardboard cutouts just don't do it for me. :shrug:
I do think Space Mountain deserves a great refurb to put it at least on par with it's cousins.
Not to mention the much-anticipated Star Tours refurb (which, it seems, is going to happen), and an update to the Great Movie Ride, and a probable annihilation of the Studio Backlot Tour to make more room for Pixar Place.