Then this could be for you.
Took the rega Dac back and also had my Arcam in toe, just to make sure my hearing hasn't gone west.
The salesperson set up the Arcam + Rega Dac and had it connected to a Naim XS amp. Anyway he agreed pretty much with my findings about the DAC/Arcam transport. Then he said would you like to hear the Nait CD5i. At that point I said: "An all Naim system is a bit unfair in comparison, as IMO, Arcam doesn't work the best with Naim." He laughed and hooked up the 5i CDP. Have to say I was immensely impressed with the Nait CDP: It had more attack and punch than the Rega/Arcam combo, and it was more focused.
TBH can't really give a sonic figure: The Rega was a little better than the Arcam on its own power, but the Naim was a substantial step up.
He also asked whether I would like a home dem of TQ Blacks. I refused, of course, only because it's over a 30 miles round trip, and I said once the rest of my kit is upgraded I'll take him up on the offer.
To conclude: Based on my short dem of the Naim CDP, it's a very decent step up in SQ.