Theoretically that should be the end of your search. Been there, felt that quite a few times. But the curse of this "Hobby" (or should I say obsession) is that it is difficult to avoid satisfying the curiosity to see if you can achieve even better AQ with a different toy.
With the HD800 I was delighted with the results using a highly modded ((better described as rebuilt) Benchmark DAC1 but then the offer of a trial with a NuForce DAC9 (to return it if not satisfied) could not be resisted -> it was better!!!
And of course the idiocy continues with the M2Tech Vaughan. Is there something out there even better than this? Probably but the bank balance, now severely depleted at the start of 2013, dictates I'll never find out. However, just to prove I'm incurable, I have a Yulong 100 II on the way so I'll do a 3 way comparison before the NuForce finally finds a new home. Expect another report in a few weeks on differences in DAC/headamps.
The bottom line in all this is that the HD800 is a superb transducer and does show up these differences.
Happy New Year to you all (2013 here already)
Hey I appreciate that John. Definately words of wisdom! Hope ya have a great 2013 mate!