The only person who can compare the Boulder to the DK and determine if it's better is you. Period. If a dealer won't let you borrow it (and for the price you'd be spending, he should), then bring your DK to the dealer's to do the comparison. To the extent there is a difference, you'll easily hear it on your speakers, but whether it's a 5%, 20% or 0% difference is entirely in your mind, no one else's.
DK Design Group vs. Boulder
Has anyone here compared DK amps with Boulder amps? I am currently using the Wilson Watt Puppy 7s with the DK VS-1 Signature with great results but I have been thinking of switching to the Boulder 1050 monoblocks and the 1010 Preamp. Will this be a meaningful upgrade worth the extra costs? Or should I leave well enough alone?