Well, the question is difficult to answer on a forum like this. For instance, I can say that in my view point, all DAC's including any modern computer line out are virtually indistinguishable from one-another when loaded with the high impedance of an amplifier input stage. I can also point out that double blind tests have been conducted which back up this claim.
Of course, at the end of the day, you'll still get a barrage of people saying I'm insane, I don't have good enough gear to hear the difference, I'm not listening right, my ears suck, I don't want to hear a difference, etc... And of course, double blind tests are irrelevant.
The prevailing opinion is that indeed DAC's make a huge difference especially with electrostats.
So ultimately, you must make your own decision on what tests you want to do to figure out what will sound good, and how you personally choose to define "sounds better".