PS audio m1200

I’ll have to think about your dilemma. But you have an outstanding preamp and speakers. Putting a much lower quality amp like PS or some others recommended here is not going to result in a great sounding system. 
 

If I were you I would be looking at Pass, Audio Research and VAC or CJ for amps.

While B&W are “hot” in the treble… Audio Research is definitely not.

My systems are under my ID.

@tweak1 

I never said or implied PS was garbage. But there are better sounding amps., ones I would consider a much better match.