i love Bad Santa since i saw it as a freshman in college in '03. hilarious. will try to watch that.
as for the others-
It's a Wonderful Life- it's really a must watch around this time of year in my opinion
Home Alone- have already seen it this season when ABC family played it post-Thanksgiving. Holds up very well for those who grew up in the late 80s/early 90s in my opinion. im not sure about the mass appeal for today's generation though.
Elf- modern christmas classic in my view.
Muppet Christmas Carol- highly underrated.
Die Hard- awesome, awesome movie to this day and i think this is really by far the best time of year to watch it.
I'm adding Girl with the Dragon Tattoo for another reason than that I saw it last year around this time...
and of course A Christmas Story- sorry, man.