Good idea, Dan. This also reminds me of how my Mosaics tend to gather dust after the initial purchase.
I have nine of the "big" sets, and the one I return to most often is the Andrew Hill. The Tristano/Konitz/Marsh comes in a close second. Byrd/Adams also gets occasional play.
Call me a heretic, but I'm still not overly enthused about both the Anita O'Day and J.J. Johnson sets. I'm starting to believe that both sets, although "complete", suffer under their own weight. Between the two sets, that's 16 CDs.