30 to 50 watts seems to be all I desire

14 wpc [tube] for my Bozaks, 100 wpc [tube] for my JBL’s, 850 wpc [ss] for my Maggie’s. Different tools for different applications. I listen to many genre - mostly old school: jazz, rock, country, blues, R&B, bluegrass - all of it! [and like you, not terribly loud - medium volumes]

I agree with the OP…30-50 watts is adequate. I’m running a Pass XA-25 and it has driven everything I’ve wanted beautifully. 300B’s are probably in my future, so less power still. 

there is a difference between a speaker being sufficiently driven versus the same speaker being driven to show all it can do at higher volumes

alot depends on the type of music, how much dynamic range is needed

smaller wattage amps often do the mids and nuances very well, but will sound compressed and/or flabby/unconvincing in the bass when the music become more dynamic

big power amps might not be as highly tactile at lower volumes but will provide a great sense of ease and naturalness as the music becomes more dynamic and complex

the sweet spot in all this depends on the specific case... speakers, taste of listener, type of music listened to, room, and volume levels

Less is more...its the "first watt"....as they say.....my class A 30 watt amp is superior to most.....at least to me ears....and that's all that matters....

What about the song 10,000 watts? Sure made Noriega give up. 

I stay at 25-35% 60-75db. Mercy the wife will punch it. I grab the Rabbit and boogie. 90-100db. Nelly Furtado seems to trigger that with her, Me I'm more of a classical guitar guy with congas, or tumbadoras. Shelia E. kinda guy.. 

I listen to a MC225 all the time. 25 wpc. Some things you just don't mess with, that little amp is one of a kind sound for sure. Nothing sounds like a MC225, it's fun.

Regards