You might want to add Music Fidelity to your list. These are a Brittish SS design that I heard driving much more expensive speakers (the Avalon Opus), and provided a very involving and musical presentation compared to Spectral SS amps that cost 4 times as much. My experience has been that musicality comes at the expense of resolution.
HELP: I need a solid state amp with a tube sound
I am very much into tube amplifiers, but it seems that they need alot more maintenance than SS amps do. Is there an amp out there that will get a good tube sound, but with low maintenance of an SS amp? I am working on my budget and I will probably spend about 2500 for it. I already have a tube pre-amp that I like, a Zen ZTPRE, and does a good job for my needs.