If I had to expand the list to 20 films, it'd look something like this:

Nosferatu, eine Symphonie des Grauens (1922) - F.W. Murnau 
Citizen Kane (1941) - Orson Welles 
Journal d'un cur de campagne (1952) - Robert Bresson 
bout de souffle (1960) - Jean Luc Godard 
Le Samoura (1967) - Jean-Pierre Melville 
2 ou 3 choses que je sais d'elle (1967) - Jean Luc Godard 
A Clockwork Orange (1971) - Stanley Kubrick 
Aguirre, der Zorn Gottes (1972) - Werner Herzog 
The Godfather (1972) - Francis Ford Coppola 
Chinatown (1974) - Roman Polanski 
The Conversation (1974) - Francis Ford Coppola 
The Godfather part 2 (1974) - Francis Ford Coppola 
Apocalypse Now (1979) - Francis Ford Coppola 
Once Upon a Time in America (1984) - Sergio Leone 
Paris, Texas (1984) - Wim Wenders 
Blue Velvet (1986) - David Lynch 
Krtki film o zabijaniu (1988 ) - Krzysztof Kieslowski 
Dead Man (1995) - Jim Jarmusch 
The Pianist (2002) - Roman Polanski 
Last Days (2005) - Gus Van Sant