You might like the Konus Audio Integrale (integrated amp) or Robusto (stereo or mono power amp). Fast, natural, alive.
Here are a few professional reviews:
Best sounding low power (under 80watts) Class AB amp?
What the world needs is a nice sounding lower power class AB amplifier under 35lbs. I'm tired of power sucking light-bulb dimming Class A designs and 80+ pound Class AB immovable boat anchors on dollies. Tubes and Class D need not apply.
An Audio Research 100.2, CJ MF-80/MF-2250 come to mind. What else is there?
What do you think? I'm I the only one?
--Sensible in Springfield.