Originally posted by: Dark4ng3l
Macross plus is where you should go if you have already watched some robotech.
Wow, the one of the few people to actually read the question! Yes, second the recommendation for the Macross Plus Movie.
Escaflowne does have a movie as well... heck, I knew the translator who did it when I was in college so it's good work but it's still too much to condense into a movie.
Didn't really like Akira (bad translation from the manga), Ghost in the Shell wasn't too good either (another bad manga translation), and Ninja Scroll I just flat out didn't enjoy... though Vampire HunterD is decent for such an old anime. X the Movie is yet another bad comic translation. It happens when you try to condense an entire series into a few hours.
The MSGundam movies (I-III) as well as Char's Counterattack + F91 are all the Gundam movies since you'll prolly like mecha stuffs.
I'm lazy and I still haven't watched Spirited Away (despite having a copy), but of Studio Ghibli stuffs, I liked Nausicca of the Valley of the Wind & Mononoke Hime the most. Almost nobody overlooks Grave of the Fireflies because it's so depressing.
One anime movie nearly everyone overlooks despite it's colossal importance to the industry, GAINAX's "Wings of Honneamise." Before Gunbuster, Evangelion, Kare Kano, etcetc that made the studio famous... the first big budget, total non-adapted story for Japanese film/anime.
Asking which anime movie is like asking "what live US TV show for a foreigner?"