I always liked Mixed Nuts. It's a very different take on the Christmas comedy. The film has an all-star cast, led by Steve Martin. The plot centers around a suicide hotline that's lost its state funding. A cast of goofy characters comes and goes from the soon-to-be-evicted hotline. The film draws a lot from the "family Christmas where nothing is going right" line of films, but is more interesting than most due to the unconventional cast.
As usual, the unifying effect of the holidays, combined with a miracle or two, helps to move the plot along and resolve conflicts.