If I'm not mistaken, the NAD 7 channel HT amps are based on nCore amps? Good stuff.
If you want to try something else, I absolutely would not suggest Pass as the only brand you should listen to.
The triad I normally suggest in solid state is Luxman, Pass, Ayre.
I feel, perhaps not always true, that to like Pass you have to come from tube gear. If you are coming from clean class-D you may in fact find it off putting, as I do, so listen to these three as alternatives.
You should also consider Parasound A series amps, but I feel you'll probably feel them equivalent to what you have, and therefore not worth the trade.
Best,
E