I always say "that movie is surely in my top 5" and now I must have about 20 movies in it.
It's almost impossible for me because of the same reasons you just pointed out, but here goes.
1. Schindler's List
2. LOTR Trilogy
3. Braveheart
4. American History X
5. Forrest Gump
All of them are fairly new, I know.
It's such a shame to leave out such films as the Indy trilogy, Unbreakable (extremely underrated too), Jurassic Park, Gladiator, Alien 1 & 2, Terminator 2, A Perfect World, A.I., Requiem for a Dream etc....