Then it's about "best for PCM RedBook" as you stated. And of course the talk will come down to technology.
George, respectfully, knock it off. Everyone reading this thread is familiar with your R2R dogma.
I have personally had great results with D/S, but if I designed an R2R from scratch, it might be equally good.
Steve, your ethernet DAC only accepts PCM. How do you recommend converting DSD?