Since this thread seems pretty moribund, i will allow myself to offer my personnal list. My favorite movies are those i could watch 1000 times:

"Nosthalghia", "The Sacrifice", "Stalker", "The Mirror" and "Solaris", by russian director Andre? Tarkovsky;
"Persona", "The 7th Seal", "Cries and whispers", "Wild Strawberries", by Ingmar Bergman;
"Memento", by brit Chris Nolan;
"Wings of Desire" and "Paris, Texas" by german Wim Wenders;
"Breathless" and "?loge de l'Amour", by swiss Jean-Luc Goddard;
"The Obscure side of the Heart", by argentinian Elisea Subielo;
"The Night of the Hunter", by brit Charles Laughton;
"Crimes and Misdemeanors", "Manhattan" and "Annie Hall", by american Woody Allan;
"The Gospel According to Matthew" and "Oedipus Rex", by italian Pier Paolo Pasolini;
"Kwaidan", by japanese Masaki Kobayashi;
"Ikiru" and "The Seven Samourais", by japanese Akira Kurosawa;
"A Touch of Evil" and "The Trial", by american Orson Welles;
"The Bicycle Thief" and "Umberto D", by italian Vittorio de Sica;
"Three colors: Blue" and "The Double Life of Veronique", by polish Krzystof Kieslowski;
"The Orders", by canadian Michel Brault;
"The Treasure of the Sierra Madre", "The Asphalt Jungle" and "The Night of the Iguana", by american John Huston;
"The Thin Red Line", by american Terrance Malick;
"Secrets and Lies" and "Naked", by brit Mike Leigh;
"The Raven" and "The Wages of Fear", by french Henri-Georges Clouzot;
"My Uncle Antoine", by canadian Claude Jutras;
"Ulysse's Gaze", by greek Theo Angelopoulos;
"The Great Illusion", by french Jean Renoir;
"Angel Heart", by brit Allan Parker;
"Amen", from french Costa-Gavras;
"Path of Glory", by brit Stanley Kubrick;
"Orpheus", by french Jean Cocteau;
"Four Friends", by american Arthur Penn;
"Death in Venice", by italian Luchino Visconti;
"Modern Times", by brit-american Charles Chaplin;
"Matewan", by american John Sayles;
"Ryan's Daughter", from David Lean;
"Hamlet", by Kenneth Brannagh;
"Amarcord" and "Fellini Satyricon", by Federico Fellini;
"The Woman in the Dunes", by Hiroshi Teshigahara;
"Faust", by Wilhelm Murnau;
"Double Indemnity", by Billy Wilder;
and many many more of course.
I think it is now and for ever well established, for anyone who cares, that i'm not only an old fart, but also a g.. dm.. pretensive asshole. Thank you.