Thanks for the response and yes, that's my thinking too. But my one concern is that the 28's can not be upgraded 100%. The transformers will not be replaced with the new ones and I suspect, performance will not be identical to the Cubed amps. That kind of stinks, but what can I do.
The Nord Ncore amps are pretty amazing. They will have been running 2 weeks straight this coming Monday 2-22-16. They were pretty great out of the box but, for my taste, the treble/highs had a bit of a bite. Now, very smooth and sweet. Very powerful and they are dead quiet, so quiet it's wonderful. Details come out of nowhere. I listen a lot late at night and at low volume, they are clear and clean. For the roughly $2300 delivered, a bargain. I like them better than the Devialet that I had. They have more tone/density/body. Just wonderful.