I think that among the films, foreign or otherwise, that have been most important in the development of cinema are The Birth Of A Nation, Battleship Potemkin, Citizen Kane, The Bicycle Theif, Breathless, The 400 Blows, Stagecoach, A Fistfull of Dollars, Rashomon.

Films that have had the most important effect on me personaly are The Godfather, Seven Samurai, Jurassic Park, Jules et Jim, The Apartment, The Lion King and Jean de Florette.