Top 10

These days, probably :

TAXI DRIVER (Scorsese)
A CLOCKWORK ORANGE (Kubrick)
BLADE RUNNER (Scott)
ONCE UPON A TIME IN THE WEST (Leone)
APOCALYPSE NOW (Coppola)
CHINATOWN (Polanski)
ON THE WATERFRONT (Kazan)
2001 : A SPACE ODYSSEY (Kubrick)
SWEET SMELL OF SUCCESS (Mackendrick)
LATE SPRING (Ozu)

Then:

THE GODFATHER PARTS I AND II (Coppola)
VIDEODROME (Cronenberg)
THE FACE OF ANOTHER (Teshigahara)
WHITE DOG (Fuller)
DON'T LOOK NOW (Roeg)
IKIRU (Kurosawa)
COME AND SEE (Klimov)
PSYCHO or VERTIGO (Hitchcock)
EYES WITHOUT A FACE (Franju)
PERFORMANCE (Roeg, Cammell)