I like Holiday Inn and it's "remake" White Christmas, plus A Charlie Brown Christmas (although that's not really a movie).
Here's an interesting article I found the other day on "It's A Wonderful Life" and its "rebirth" in 1974. I often wondered why I never saw it growing up...now I know.
Another one that has a fun Christmas scene, although it is not a "Christmas movie" (technically) is "Desk Set" with Katharine Hepburn and Spencer Tracy.
L