Great films? Like the weather, they're a subject everyone likes to talk about. And like politics, they're always good for an argument. But everyone has opinions.

Among the latest to weigh in are professional producers.Here are the 25 landmark films produced between 1927 (the end of the silent era) and 1980, as chosen by the Producers Guild of America, a 400-member organization of film and television producers.

All Quiet on the Western Front (1930)

Around the World in 80 Days (1956)

Ben Hur (1959)

The Best Years of Our Lives (1946)

Casablanca (1942)

Citizen Kane (1941)

Fantasia (1940)

From Here to Eternity (1953)

The Godfather (1971)

Gone With the Wind (1939)

The Grapes of Wrath (1940)

High Noon (1952)

The Informer (1935)

The Maltese Falcon (1941)

Midnight Cowboy (1969)

Mr. Smith Goes to Washington (1939)

Mutiny on the Bounty (1935)

On the Waterfront (1954)

One Flew Over the Cuckoo's Nest (1975)

Snow White and the Seven Dwarfs (1937)

Stagecoach (1939)

Star Wars (1977)

Sunset Boulevard (1950)

The Treasure of the Sierra Madre (1948)

The Wizard of Oz (1939)