Yeah. All of them are great. I don't own any of them, well, except for an old copy of Totoro... but I don't watch it because VHS tapes are obsolete in my house now... But yeah. Castle in the Sky is amazing.
I really want to see princess mononoke in the original japanese. They say that a lot of good stuff was lost in the translation, but I still loved it. I really like Castle in the Sky and Porco Rosso. Both great movies.