I've got a few:
Christmas (Baby Please Come Home) - U2 version - it's the boys!
Stille Nacht - auf Deutsch!
Gabriel's Message - I love how the song tells the story. Very cool.
Joy to the World - best with a huge choir and orchestra. This one makes my soul happy.
Heat Miser/Snow Miser 
- swingin'
Have Yourself A Merry Little Christmas - Coldplay version - this is the ultimate wistful, melancholic Christmas song