Jeff,
I'm sorry I don't follow your statement about the Quad series 2 and 3. Were they so different that they cannot be combined?
I used to have a pair of 57's, but unfortunately they did not work well in my room; the holographic imaging I had heard in the salesroom was not there in my small room. Great as they sounded, I could not hear any depth; no such problem with my SL3's. I think the Quads need a lot more space to work correctly.
Alternately to Fjeff, are you also known as Fredj (as in Flintstone)?
I know you like medieval music, but how about Gregorian Chant and other religious music?
Bernard