Conrad Johnson Premier 12 tube monos

Tpsonic- thanks for the feedback- I actually had the ATM-3 monoblocks in my place as well for a quick session (I have also owned the ATM-4). Very 'full' sounding, but perhaps not as 'fast' as other amps I have tried- truly, I don't think I gave them enough of a chance... How do you like them vs any other tube amps you have tried?

Guys- great responses- thanks. Speakers are 97 db 14-ohm Coincident 'Victory' model with Ribbon tweeter. On paper, you may be thinking even SET, but them seem to like more power, and my room is HUGE open concept. Preamp is modded Sonic Frontiers Line 3. I used to have the ARC VT-100 MKIII- that worked well with my Pre.

Should also mention this system is used for 2-ch HT as well, so I do appreciated an amp with low noise floor and good bass capabilities, which is why I decided to try the '6Moons SS favorite' Audiosector Pateks- running them in mono (balanced- sonically great on many fronts- however I do miss the 'X factor' of added tube dimensionality- particularily in the extra decay of the notes a good tube amp can bring).

I believe the Premier 12's are single-ended only, therefore not taking advantage of the fully balanced architecture of the preamp, however that is not 'make it or break it'- I would consider single-ended amps like the Premier 12's if they really ARE that good. Other than the ARC VT-100 MKIII, not sure what other fully balanced tube amps there are at under $5k used that are better than the ARC- I hear VAC makes great stuff, but $$$...

re: Atma-sphere- concerned about heat and hot tubes exposed (have 2-yr old running around in that same room). Dopogue- in fact, have tried 845's before in the system, and liked them very much. A local guy has a set of J.C Verdier 845 monoblocks that I hear are very good...
Cyto- Music Reference?? Don't really know them, but will look into it- thanks again everyone for the great responses!