wow, too hard to pick an official top 10 list but this is currently what I would say is my top 10 as I glance at my DVD's-

Dances With Wolves
It's a Wonderful Life (the current 2 disc DVD release is a great looking
B/W true version with a very nice(!) Color version too)
Glory (top-notch Civil War film)
Westworld (great, late at night, "popcorn" movie to watch)
It's a Mad, Mad, Mad, Mad World
The War Wagon (John Wayne and Kirk Douglas western fun)
The Godfather
King Kong (the good 'ol 1933 year version)
Ace Ventura When Nature Calls
Airplane 2 The Sequel (but the first "Airplane!" is great fun too!)

make it a top 20 list and I'll be glad to throw in Pulp Fiction & Dusk to Dawn to show I'm a Chessplayer too like the folks posting above me!
Tonight, after seeing the news, I'm gonna watch again another of my favorites- "A Knights Tale" with Heath Ledger(R.I.P. at only 28 years old!)