1. regarding "DAC section only" comparison that isn't going to happen for awhile. I don't have a 3.5mm to RCA cable yet to use the GO line out to my Vali.
once I do, it would be a 3 way comparison between: Concero HD, iDSD nano and GO450. whew. not sure I've got the discipline to do that properly.
2. maybe in 1-2 weeks can do a "very short" DSD shoot out with some limited files (some classical, also have 2 new r.e.m. DSD releases)
between the GO450 and iDSD nano with the HP50.
due to my usage (multiple offices) and iDSD nano having a battery which makes for great match to iPhone/iPad, don't have any intention on selling iDSD nano even if GO has some slight gains.