I can't really pick one. At times, several were my favorites, then as I listened to them repeatedly they were replaced by more neglected ones. Right now I'd have to say Demon, Karma, and Epilogue. I just love the end of Karma, it's one of the best moments in their music, though that similar part in BWP might top it for me. I'm glad some people are pushing Epilogue also, it's just such an emotional and inspiring song somehow.
-Hondo