i have not personally heard the new technics stuff... i do agree that pretty nad class d is mediocre sonically, easily surpassed by other amps
i would suggest class d mini gan 5 on low end (a lot of amp, very good sound, for the very modest cost)
otherwise, consider devialet or agd on higher end... they are very very good
atmasphere another well reputed new entrant into higher end class d but i have not personally tried