Well it looks like the Wadia inputs support 48k, 44.1k, and 32k inputs (at up to 24bit word length, I assume). See
http://www.wadia.com/news/contents/2496upg.htm. That is going to be what your DVD player with output. PCM at either 48k or 96k and up to 24bit word length. I'm sure someone will correct me if I am wrong. You DVD player's set up menus should have settings to enable folddown of the output to PCM. My Panasonic RP82 does. I imagine your Denon does too.
As for your electronics vs. loudspeaker inquiry. I feel it is a rare day when one spends less on his amplifiers than on his speakers. my $0.02, YMMV.
I don't know anything about Norh, but I would consider something else. But that's just me. Soemtimes you see a McCormack DNA-1 dx for $600. The Audio Alchemy OM-150 for $400 right now would be decent - but I'd research the reliability first. AA is out of business. The one I sold broke about 6 months later. $400 is an OK price for that amp. Also consider the old standby - an Adcom gfa555II. ALso saw an N.E.W. 20.1 class A amp in the classifieds. Though you may not be satisfied with 20 watts.
I would think the McCormack to be the best of the bunch and Steve McCormack has a bunch of upgrades available for his older amps. Either that, or pick something that resells well.