Of those on your list the only one I have seen was Babel, while I have been meaning for awhile to sit down and watch the original Nosferatu silent film.
I am a film major so I see a lot of 'art' cinema. Most of it I do enjoy. I haven't seen much over the summer but Candy (2006) I thought was really fucking good even if overly typical in most places. The chemistry between the protagonists felt extremely authentic which is I guess what made the whole movie work.
Some of my favorites:
Wild Strawberries
2001: A Space Odyssey
Citizen Kane
Rules of the Game
Breathless
The Sweet Hereafter
Atanarjuat
The Red Desert
Blow Up
Before the Rain
...off the top of my head.