I would find out what dealers have tube amps available new in your area and audition them. See what brands you like the sound of. Most offerings from a company have a similar type of "house" sound. I would look at maybe Cary, VTL, Manly, Rouge, CJ and see what you like the sound of. You might have a listen to an Audio Research amp also though I don't know that I would call their amps lush. Then look for used amps from the manufacturers you like the sound from.
I will tell you that both Cary and Audio Research have excellent customer service if you need parts or repair. I am sure there are others but these are the ones I have dealt with.