Check out the Cayin line. Incredible build quality and looks with magical sound to match. It should be a very dramatic improvement over your NAD given you have ample power.
Tube or not to tube?
I am new to the hobby and would like some input. I am seriously considering moving to a tube-integrated amp (new or used)like the PrimaLuna II or the Jolida 502. Currently I have the NAD Combo 162/272. Would I be upgrading my system with either of the tubes? Or am I just moving sideways?