Didn`t we have this thread somewhere already???
Anyway, with me it`s everything by Jean Eustache, Sarunas Bartas, Sergei Paradjanov (restored prints), old Mamoru Oshii (Angel`s Egg, etc.), Walerian Borowczyck, Jerzy Skoilimowski, Ken McMullen, old Lubitsch (early 20s), more Mizoguchi and Naruse, "Nouvelle Vague" by Godard, more pre-fifth generation Chinese films, more by Mauritz Stiller, etc.,etc.
And 1900 would be great of course. Maybe they even find a longer version.