I love Christmas music.
My favorite carol is really probably whatever one I'm singing at the time, tho there are some I like better than others:
Gesu Bambino
O Holy Night
Joy to the World
I Heard the Bells on Christmas Day (alternate tune)
For recorded holiday music, I love the whole Christmas album by Leontyne Price. She includes both Ave Maria's, and the Mozart Alleluia!
Luciano Pavarotti's and Mario Lanza's are big faves too, and best of all is an old lp of the Festival of Lights from the University of Redlands.
Contemporarily, of course Nat Cole's Christmas Song, and I love Diana Krall's version of "Have Yourself a Merry Little Christmas." Have you heard Joe Williams' "That Holiday Feeling?"