"Grave of the Fireflies"
- nice and depressing
"Macross Plus Movie"
- I have only seen the ovas but I heard that the ending for the Movie is a little more well developed
"Spriggan"
- good action/adventure movie, reminds me of Akira
"Escaflowne"
- nice mech design, and I liked the bitter-sweet ending
"Death&Rebirth/End of Eva"
- love it or hate it, its Eva
"Metropolis"
- I severely disliked this one, but alot of people liked it
"Utena: The movie"
- I plan on watching this one after I finish the series (hmmm, i'm suddenly hungry for curry rice...)
"Wings of Honneamise"
- Another one on my too watch list, produced by the boys as Gainax, Critics seem to like it
Anything by Miyazaki
- always good time with these films
and this is just a small list, hopefully most of these films are well known enough that you can find them in Belgium,(hell, alot of these movies were at my local block buster ^_^)
you might want to check out
http://www.animeondvd.com for a list of dvds available in your region. However, since you are in the same region as Japan, I don't know how helpful this will be.
-Metro