Yeah I saw those D79's recently advertised and was tempted. You have yourself one fine amp there and I doubt you can do too much better as Alex says. That amp has a legendary midrange if you haven't already discovered. I heard one once years ago and it never left me like most of ARC gear from the "all tube" days before they went down the hybrid road. The D-79 is probably at the top of all those esteemed amps. Enjoy!