A number of good suggestions there. I have uised a 20 watt SET integrated for years and have found speakers of 89db sensitivity and up will do fine with my amp, as long as the impedence is benign. That is flat and 6ohms and above.
some other speakers I have used which seemed to go well
Living Voice Avatars
Acoustic Zen Adagios
Daedalus Da-Ra Mas
The last are way the best, but a bit out of your price range, if you can't find them second hand, which you wo'nt
some other speakers I have used which seemed to go well
Living Voice Avatars
Acoustic Zen Adagios
Daedalus Da-Ra Mas
The last are way the best, but a bit out of your price range, if you can't find them second hand, which you wo'nt