I could name 25 favorites just from each genre. Man it's really hard to pare down, for there are so many. But I will attempt to present the best of the best, even though I will forget some that should deservedly be in the list.
Not in any particular order:
The Road Warrior
The Good, The Bad, and The Ugly
Planet of the Apes (1968 - Charlton "Take you stinking paws off me, you damn dirty ape" Heston)
Shawshank Redemption
Schindler's List
Die Hard
The Great Escape
Ferris Buellers Day Off
The Star Wars Trilogy (Episodes IV, V, & VI)
Star Trek II, III, & IV (I consider this a trilogy)
Forest Gump
My Name is Nobody (Great spaghetti western with Henry Fonda and Terence Hill)
Terminator 1&2 (Terminator 3? Meh.)
The Towering Inferno }
The Posideon Adventure } I know, I know, but I loved those disaster movies. Irwin Allan Rocks.
Airport '75 }
Beverly Hills Cop
One Flew Over the Cuckoo's Nest
The Usual Suspects
Falling Down
Dirty Harry
Saving Private Ryan
Napoleon Dynamite (My kid's favorite! Please tell me they will do a sequel: Napoleon Goes to Community College)
X-Men 1&2
Toy Story