This is interesting in that I have been thinking about the following:
1) 4b-st plus ATI AT2005 or Sherbourn 5/5210 (or Rotel or B&K)
2) 3b-sst plus the 9b-sst
I just got a 4b-st Fri.
My problem with the 4b-sst plus the 9b-sst is "balance". I know all about size of the room, speaker efficiency, and listerning levels, but 300W/ch for the mains and 120 W (150W really) everywhere else just doesn't seem "balanced". (Psychologically for power levels, not final volume.) I also have this thing about wanting 200W/ch. No reason.
But Mike, I would be more interested in your experience with the 3b-sst and 9b-sst...