The Next Great Debate - UPDATED (again)

I posted this on the Facebook page last night. Woke up this morning no closer to a decision. Hrmph.

So assuming I'm ever awake long enough to finish Mistletoe Murder, I'm debating between the following for my next Christmas-y read:

Hercule Poirot's Christmas - Agatha Christie
Santa Cruise - Mary Higgins Clark & Carol Higgins Clark
The Stupidest Angel - Christopher Moore
Unholy Night - Seth Grahame-Smith

I read The Stupidest Angel pretty much every year. Part of me is thinking "do something new." Part of me is thinking "stick with tradition!"