Scrooge / Christmas Carol (1951 - Alastair Sim - No contest on the CC market IMO)
Miracle on 34th Street (1947 - Richard Attenborough aside, the 90's version was a POS)
It's A Wonderful Life (I not sure I can trust anyone who doesn't like that film...)
And I have to admit - As much as I'm not necessarily a big Will Ferrell fan, "Elf" is a pretty decent movie that I think people will still be watching 30 years from now -- Not unlike A Christmas Story. Can't complain much about Polar Express either...