Why not just buy a tube amp and stop hoping to find a SS amp that comes close?
Steve Nugent's thoughts got people all excited, but maybe you guys missed the part about him actually USING a TUBE amp...not these other SS amps. (Plus, he was previously using a John Curl designed SS amp that he further modified to extract performance, yet it STILL wasn't enough and now he uses tubes.)
To each his own, but, personally, I don't see why anyone would spend that kind of money on a class D amp or small company SS amp, when you could get an ARC Reference amp that will drive almost any speaker for the same price.
Odds are good that you will then laugh at all the SS amps futilely trying to duplicate that sound...plus have a ready resale market...lifetime service...and unparalleled pedigree.
Many SS amps sound really nice and even have tech specs that sound better on paper. I use several myself, but, for ultimate sound quality, most people eventually return to tubes and not vice-versa for a reason.