(Not entirely Amp related but regarding downgrading).
Well this is an interesting thread for sure.
As a matter of fact I just sold my Kef LS50s.
In place (currently) are a pair of Definitive Technology Studio monitors SM50s that I bought on the cheap on CL.
At first I keep switching them in and out and thought boy these
DT sound pretty good. Long story short they sound great to me, maybe they are a better fit for my Peachtree 150 or just sound better to my aging ears. Don't get me wrong I liked the Kefs (sound / look and build quality) but ended up downgrading. The Kefs may have responded to a better amp but I am not interested in pursuing that at this time.