For solid state amps, I have had three Parasound amps and could not be happier with the Halo A21. Tremendous power, great finesse. Never any hum or noise. I had a Odyssey Stratos and it was nothing but trouble, both with quality and customer service. For hard to drive speakers with lower sensitivity ratings, I agree sometimes solid state amps are better. I think the first 10 watts of the A21 is class A, and after that it switches to AB. The newer A21+ is out, so you may find great deals on the A21.
http://www.theabsolutesound.com/articles/parasound-halo-a-21-stereo-amplifier/
http://www.theabsolutesound.com/articles/parasound-halo-a-21-stereo-amplifier/