Matt, I also like several of your picks...
Big movies: The Great Escape, Bridge on the River Kwai, Ben Hur, Lawrence of Arabia, Titanic (The OLD version titled "A Night to Remember"), Star Wars (the first was actually "Episode IV: A New Hope" in 1977, and changed the face of sci-fi as we now know it), Chitty Chitty Bang Bang (Ian Fleming's [creator of 007] only children's story), and The Wizard of Oz.
Fave's: Casablanca, TORA! TORA! TORA!, Sink the Bismark!, Anna and The King of Siam (The old black & white version, also with Yul Brynner, and the color version with Deborah Kerr and Yul), Star Trek: TMP (After Star Wars it was really good to ramp the ST universe back up), The Unsinkable Molly Brown, The Ghost and Mrs. Muir, The James Bond 007 franchise, Forrest Gump.
Comedies: Duck Soup (The Marx Brothers), Any of the original Disney "Herbie" franchise as well as several other Disney films, notably Bedknobs & Broomsticks and Mary Poppins, The Pink Panther (ALL).
Musicals: Beaches, The Sound of Music, Fiddler on the Roof, My Fair Lady, The King and I (the color version), Gigi.
Gay themed: The Bird Cage, Brokeback Mountain (actually a love story about a 20 year relationship that just happened to be a man-man relationship).