Yep, saw all Ghibli films except for "Only Yesterday" and "My Neighbors the Yamadas".
Porco Rosso: Good film, but not one of my favorites. Nice aeronautic scenes however.
Princess Mononoke: Lovely film, but the special version has not the complete storyboard (like the other films I ordered). I order it next time.
Grave of the Fireflies: I don't know. Maybe I don't know enough about the japanese history or the film was just to sad. Don't like it very much.
[edit]
I like Spirited Away the most so far