Like @badgerx16, there would be a lot I'd enjoy, so it could change. Random favs, I won't pass by.
Seven Samurai - A mix of action, numerous character subplots and dealing with wider cultural changes.
Le Diner de Cons - So funny that even the characters burst out laughing at what's going on.
Micmacs - Uplifting flights of fancy, built on sadness, heists, togtherness and the arms trade. Amelie also a great watch.
Quatermass and the Pit - A superb example of a multi layered plot, with Hammer production values.
Aliens - Keeps a lot of the beats of the original, and as much as I like that one, I watch this one more.
Akira - A worthy, but not slaveish take on the manga. Lots of layers from political intrigue to evolution of our species.
Rosencrantz and Guildenstern are Dead - Oldman, Roth, lots of wordplay and physical comedy around a tragedy.
Metropolis - Years ahead of it's time. M is the better movie, but I've seen this more.