Wish I could comment on the Pass Labs gear, as it certainly enjoys a great reputation, but, alas, I have never had it in my system (well, an Aleph 0 back in the 90's!). I can vouch for the PS Audio BHK 300 mono's, which I have been using for ~2 years now. They are very nice amps, IME, and they run my TAD CR-1's beautifully. I think you cannot go wrong with them (and the 6922 tube input for system "tuning" is a very nice feature). Just my 2 cents.
