I've seen the GF trilogy, or parts of it, at least 2000 times. Next is Goodfellas, about 300 times in whole or parts. After that, Mean Streets, ~250 times. I also like older gangster films: have seen Little Caeser, Public Enemy, The Roaring Twenties, Al Capone, probably 75 times each. Honor Thy Father, a very good made-for-TVer about Bill Bonanno: 20 times.