Charlie Haden is one of my most favorite bassist in the jazz history. I think nobody will be surprised if I'll tell you that I prefer his earlier recordings, even as a sideman, over the later ones. His recordings with Ornette Coleman and with Keith Jarrett can't be compared to Beyond The Missouri Sky for example or to The Art of the Song.
Among his recordings as a leader, The Montreal Tapes and the several duets he recorded are my favorite. During the last week I found the time (as you can imagine, between one news report to another...) to listen to all of his Montreal Tapes recordings and I would like to know which one of these recordings is your favorite. My vote goes to Geri Allen & Paul Motian.