The amount of power with the HD800s was not an issue from my experience, though sounds like it was for the LCD-1. Did you get a chance to give your HD800s a listen too? I suspect as we both like the Platinum sound more, we wanted increased impact (though earlier meant 'flat' as even, not boring - though obviously less engaging then we're both used to). However I'm not sure that's because of lack of power by the DNA. From my previous experiences and generalizing, blindfolded I'd probably have thought the DNA was a controlled SS amp. Not my preference when going tubes (and with the HD800), and certainly far from the Extreme Platinum with either of our tube combos. Interesting another member (forget name) told me at the meet how much the DNA and SPs sounded similar.
I have to admit not being a fan of Beyers, and like JP mentioned on the other site, it would have been interesting to hear the DNA with a HD580/6X0.