I too am in the "digital is digital" camp. Assuming your transport isn't having issues, a different transport will result in no changes. I think your money is better spent upgrading your DAC. My DAC is the most expensive single component in my system.
Transport Question
Now have the new Rotel CD player using as a transport into a Bryston bda-3
The bryston make a big difference.
Time for a good stand alone transport. Looking at the SIm moon 260d.
Would that be a decent upgrade for the rotel?