These types of lists are always utterly subjective, as for me, it changes regularly. There are, however, many that won't shift off my 'top' lists. I now have over 1000 movies on DVD & BluRay, but here's the most regularly visited (in no order):
It's a Wonderful Life
Ghostbusters
The French Connection
Enter the Dragon
The Shawshank Redemption
Star Wars: Empire Strikes Back
The Goonies
Ferris Bueller's Day Off
Rear Window (along with about half a dozen of Hitchock's other great works)
The Bridge on the River Kwai
and so on....