Maril555:
Just curious as to what you ended up doing, here. I have an NS999ES on its way to me, and I am considering the Modwright upgrade option. In my case, I am also hoping to upgrade my pre/pro to a significant degree (either Krell HTS 7.1 or Theta CasablancaIII), so my guess is that without spending a good amount on a dedicated DAC, I am not going to hear a noticeable improvement on the D/A side of things. Of course, the nice thing about the Modwright upgrades are that they don't limit your ability to add a DAC, just provide you with another option. But then you are back to your which is the best bang for the buck question...
Tom.