Thanks for another great list John. I like your idea very much, and I would like to see it extended way over 1000 films.
I know it may be much work, but I think it would be better if you would list the films chronologically than alphabetically, so that one has a better overview. But it may be much work.
Additional masterpieces (or close to it), but I'm not sure if all of them are missing:

Zina (Ken Mc Mullen / UK / 1985)
Mes petites amoureuses (Jean Eustache / France / 1974)
Red Wheat (Zivojin Pavlovic / Yugoslavia / 1971)
Dancing in the rain (Bostjan Hladnik / Yugoslavia / 1961)
Ganga Bruta (Humberto Mauro / Brazil / 1933)
Saint Tukaram (Vishnupant Govind Damle, Sheikh Fattelal / India / 1936)
The Fiances (Ermanno Olmi / Itakly / 1963)
Black Peter (Milos Forman / Czechoslovakia / 1964)
La derive (Paula Delsol / France / 1964)
Identification Marks: None" (Jerzy Skolimowski / Poland / 1964)
The Sword of Doom" (Kihachi Okamoto / Japan / 1965)
Django (Sergio Corbucci / Italy, Spain, France / 1966)
Othon (Jean-Marie Straub, Danile Huillet / West Germany, Italy / 1969)
A Simple Event" (Sohreb Shahid Saless / Iran / 1973)
Lady Snowblood" (Toshiya Fujita / Japan / 1973)
Two Men in Town" (Jos Giovanni / France, Italy / 1973)
The little Mermaid" (Karel Kachyna / Czechoslovakia / 1975)
Mad Dog Morgan (Philippe Mora / Australia / 1976)
Raise Ravens" (Carlos Saura / Spain / 1976)
A Dirty Story (Jean Eustache / France / 1977)
Mother and Daughter (Giovanna Gagliardo / Italy / 197 
Possession (Andrzej Zulawski / France, West Germany / 1981)
Moonlighting (Jerzy Skolimowski / UK / 1982)
Wu lang ba gua gun "Eight Diagram Pole Fighter" (Chia-Liang Liu / Hong Kong / 1983)
Der Aufenthalt "The Turning Point" (Frank Beyer / East Germany / 1983)
Class Relations (Danile Huillet, Jean-Marie Straub / West Germany, France / 1984)
Angels Egg (Mamoru Oshii / Japan / 1985)

and I'll list more in the future, as my time on this PC is almost up.