I only have 7 for now that I really liked. (I did not include US or UK films)

Nosferatu- Murnau
Un Chien Andalou - Bunuel/Dali
Faust - Murnau
Man with the Movie Camera - Vortov
Metropolis - Lang
Passion of Joan of Arc - Dreyer
The Cabinet of Dr. Caligari - Wiene

Sara 
(I need to watch the Battleship Potemkin again because the first time I saw it, it was not one of my favorites...)
I also saw the Chess Player (Bernard) and Bed and Sofa (Room) neither of which I could rave about.