"Scrooged" is a classic, in my opinion. A modernized spin on an old classic with Bill Murray. I seriously doubt the awesomeness of this adaptation can be recreated (properly). It's not only okay to watch for the kiddies, but good for the adults.
"A Christmas Story" A cult classic that will more than likely run all day on TBS [though I own the DVD]. This Christmas tale follows Ralphie, his home life, his school life, and his quest for a BB gun. The film didn't do so well upon release, but is beloved by many today. I saw a snippet of the musical a week or so ago on The View....yeah, just stick with the original film, folks.
"Bad Santa" is crude and rated R and stars Billy Bob Thornton. But, like a lot of Christmas stories, it is a tale of self reflection, discovery and change. No, really. This film, come to think of it, is like an inverse of a Scrooge tale. Thornton's Willie is a thief, a sex addict, and a drunk (and apparently, Thornton was actually drunk during filming). Brilliantly done film.
Note: I think there should be a "Festivus" movie with the Costanzas. I'd pay to see that.