Second the Sudden A21SE recommendation. I own that amp myself. It is immediate in reproduction.... I mean really quick. Everything else seems slow off the mark and a bit sloppy. Midrange is sweet and bass is tight but not thunderous or really deep. Do not shy from the 30 watts Class A. It will drive most anything and scary loud.
It does not possess the sweetness of really good tubes, so don't believe that comparison. I run Manley tube gear and it will not compete there, but then it did not cost 14K.....duh. Terrific piece.