SS Amp for Avalons

Avalon Opus w/ Spectral 360s They like power!! Speakers are as fast as the amps

Symphonic Line Kraft monos for solid state.

For tubes, I have not heard anything that beats the CATs with Avalons.

Although I've owned Avalon/Spectral and heard it many times at dealer, I preferred Avalons with BAT tube monoblocks or Atma-Sphere monoblocks. The BATs had more bottom end power but the MA2s had a great mids & treble particularly on acoustic instruments and classical music. If you are a rocker, BAT might be a best choice. If SS, I agree that Symphonic Line and Pass are some of the best options. Cheers,
Spencer

my favorites are Ayre and Audio Research

The CAT amp may have all the power and finesse, depending on room size and music preference.  I heard Ascents driven by Gryphon amp.  It was unforgettably good.  I have found the Diamonds to be revealing, requiring careful component and cable matching.