Elizabeth, I am with you on the McInstosh with Maggies, not a good match. I had the 501's for a ahort time, and they didn't match. But the Mac's did match great with a friends gear, so it's a case of how well they match.
MoFi, I agree on Pass and the Sanders, they are stellar, both. But I think the Bryston Gear is on the same level. Magnepan uses all Bryston gear to demonstrate and test, so that should tell you something about the the compatiblity.
Bryston + Maggies = Audio Happiness.