+1 on the Quicksilvers.
I have the mid mono monoblocks. They are wonderful and have no problem driving my 90db efficient KLH 5s to fairly high listening levels. They also worked very well with some Snell Towers I had before.
I find they have plenty of slam and in fact were better in this regard and have better bass than a Belles 150a power amp and a Luxman integrated that I previously owned...both with over 100W per channel solid state. It provides wonderful bank for the buck.
Also easy to try different tubes. Want slam...run KT88s.... want a lusher presentation,,,,run EL34s which is what they are voiced for. Also they are very well built and have been utterly reliable over the 5 years I have owned them which is more than I can say for some Cary and Audio Research gear I had.... albeit a long time ago. Some of the most musical amps I have owned in over 50 years in the hobby. They are keepers. BTW I also run a tube preamp, Conrad Johnson.