In 2000, it was reported that a man named Brad Bourland had watched and ranked 9,331+ English-language films in a quest to identify the best, most important movies of the 20th century. While his complete list of rankings is no longer available, a user at Sporcle created a quiz that includes Bourland's top 2000 (or nearly: the final film was missing from the quiz!). It's an eclectic mix that excludes, in addition to foreign films, silent and animation films. The time span appears to range between the late 1920s-2000.
How many have you seen?