For now there will not be any class d being tried in my system , not made of money and the Wilsons took all my spare "hifi play money"...lol
The brief trial of my nuforce in my stereo rig did not go well although I am sure there are really good class d amps out there at a price.
I have never tried tube power amps so have no basis for comparison there, did have a couple of tube pre amps but always been ss power amps
And right now the marriage of mcintosh pre, bat power and wilson speakers gives me goose bumps with the right source material!