The collection is 99% my choice, mostly because my wife really doesn’t like to watch things more than once. This is an incomprehensible world view to me. However, I am also the one with the good memory for what we’ve seen, so occasionally my wife will admit she doesn’t remember the plot and is OK with seeing a film again.
I haven’t counted recently, but I expect my current library is in the 400-500 range. There is the SF area, with The Day the Earth Stood Still, Forbidden Planet, When Worlds Collide, This Island Earth on one side, and Alien, etc., Star Wars, Blade Runner and so on on the other.
Various classics including Metropolis, King Kong, M, Grand Illusion, Sunset Boulevard. Thrillers and heists and capers including Saboteur, The Third Man, Rififi, The Killing, The Italian Job, Heat.
Westerns including My Darling Clementine, Shane, High Noon, Little Big Man, Silverado, Unforgiven.
WWII including ones that got it wrong for propaganda reasons like Bataan and Air Force, and ones that got it right, like Thirty Seconds Over Tokyo and They Were Expendable. And A Walk in the Sun, Guadalcanal Diary, Attack!, Battleground.
Blockbusters like Lawrence of Arabia.
Seven Samurai, Throne of Blood. The Umbrellas of Cherbourg, Le Samourai.
The Battle of Algiers, Platoon, The Boys in Company C.
The Duelists, Women in Love, The Manchurian Candidate
TV like Peter Gunn, Secret Agent.
And then musical comedies, documentaries, animation, action . . . whee!