Denon: 37.5 lbs, unit weight
Harman Kardon: 55 lbs, unit weight
Pretty obvious to me which puts out more power.
Never believe power ratings, they're either conservative or too high(in HK's case, conservative, in Denon's case, too high).
Of course, the HK costs a lot more money.
Weight is a big factor. Even if it's expensive, it can still have a wimpy amp in it. The Yamaha 2500 didn't fare too well at 4 ohms(see
here), and it's a pound less than the denon.
I recommend buying refurbished: you get lots more power per dollar.
harmanaudio.com has lots of HK refurbs. Also,
spearitsound.com has lots of NAD refurbs. NAD rates power conservatively, has lots of dynamic headroom, and for a similar price to the Denon(refurbished), the T773 is 20 lbs heavier.
Probably puts out the same as the HK except for a lot less, so it seems like the logical choice excluding features. I'd go with the HK if you only had those two to choose from just because of the more honest power rating.
