Richard,
Don't encourage Josh to sell his FPB200. I am hoping that he would buy my FPB200. Seriously, I have compared the mono FPB250 to the 200 and the monoblocks are much better but it also cost alot more. In my current system, I have 3 FPB250M and a FPB200.
I have heard the 300 but not the 600. The 300 is better than the 200.
Are you a DDS in SF? I remember seeing your name a few years ago when I was looking for a dentist in the city. BTW, I have root canal procedure tomorrow morning.
My name is also Richard - great name.