absolute favorites:

8½ (1963)
La Dolce Vita (1960)
-- had never seen Fellini before, yet his work remains imaginatively brilliant some 60 years later

The 400 Blows (1959) -- masterpiece, perfect

Breathless (1960) -- went on a heavy New Wave Godard kick, Vivre Sa Vie is his best film but this one is still a standard

Ordet (1955) -- stunning by the end, becomes much more than it seems

Stalker (1979)
Andrei Rublev (1966)
Mirror (1975)
-- I believe I had only seen Solaris at the time of the last S&S list, but Stalker punched me in the face. that's a maybe top ten, for sure top 25 all-timer for me. Rublev is the only 4 hour movie I'd watch again. Mirror is a visual, dream-like masterpiece. definitely one of my favorite directors now.

L'Avventura (1960)
L'eclisse (1962)
-- another director I had never seen before, I ate these up along with the rest of Antonioni's filmography. L'Eclisse is by far my favorite, and one of my favs of all-time.

The Battle of Algiers (1966) -- holy shit, was this a documentary or film? amazing

Aguirre, Wrath of God (1972) -- same as Algiers, so goddamn naturalistic and enthralling; had never seen any Herzog before this

The Third Man (1949) -- clearly a movie of its era but so damn good that it transcends it and is just as enjoyable today. best ending ever

***

worth watching:

Wild Strawberries (1957)
Persona (1966)
The Seventh Seal (1957)
-- Bergman can be a little much, although there's no doubt his films are special

La Grande Illusion (1937)
The Rules of the Game (1939)
-- liked them; I really can't imagine so many people think these two are among the top 5 or 10 movies made in cinematic history

The Passion of Joan of Arc (1928) -- intense! more Dreyer good stuff

Late Spring (1949)
Tokyo Story (1953)
-- Ozu is very meditative, I like him but I don't feel compelled to revisit his works. Hiroshi Teshigahara >>>>

Playtime (1967)
Close-Up (1990)
Bicycle Thieves (1948)
The General (1926)
Pierrot le Fou (1965)
City Lights (1931)
Modern Times (1936)
The Night of the Hunter (1955)
Barry Lyndon (1975)
Sans Soleil (1982)
Sansho Dayu (1954)

****

not a fan:

Au Hasard Balthazar (1966)
Pickpocket (1959)
A Man Escaped (1956)
-- Bresson is just not my thing; his films are dour to me

Blue Velvet (1986) -- not huge on Lynch

Jeanne Dielman, 23 quai du Commerce, 1080 Bruxelles (1975)
Journey to Italy (1954)
Ugetsu Monogatari (1953)
Fear Eats the Soul (1974)
Imitation of Life (1959)