I've watched Christmas Vacation twice so far. The Rankin-Bass claymation ones are some of my favorites. (Santa Claus is Comin' to Town, The Year Without a Santa Claus). Charlie Brown is a must watch, as is the animated version of How The Grinch Stole Christmas. My mom has been watching those romantic Hallmark movies, which I can't stand!
My must watch Christmas Eve movie is A Christmas Story. I've never seen It's A Wonderful Life, Elf or Miracle on 34th Street.