Sounds like a nice amp but isn't that way over your price range of $350-450 or did you get a bargoon? I was going to suggest the Yamaha P-S Series:
http://www.yamahaproaudio.com/global/en/products/poweramps/ps_series/specifications.jsp
The P2500S and P3500S are in your price range new. They are powerful, cheap, reliable, sound good and run quiet without fan noise. Later you could get balanced preamp or DAC and run balanced.
Buying new with warranty means you don't have to worry too much about recapping costs, amp drifting out of spec, humming transformers, solder joints going bad, etc. Not sure if you would like the sound better or worse since I haven't compared directly to DNA-1.
http://www.yamahaproaudio.com/global/en/products/poweramps/ps_series/specifications.jsp
The P2500S and P3500S are in your price range new. They are powerful, cheap, reliable, sound good and run quiet without fan noise. Later you could get balanced preamp or DAC and run balanced.
Buying new with warranty means you don't have to worry too much about recapping costs, amp drifting out of spec, humming transformers, solder joints going bad, etc. Not sure if you would like the sound better or worse since I haven't compared directly to DNA-1.