Oh yes, and if you haven't already, use the search feature on this site. You'll find tons of info and not have to wait for people to reply to this thread. Both of these receivers have been talked about relatively frequently.
Antonio, I posted this link before, but to save you time, here it is again. http://www.hometheatermag.com/receivers/ Both receivers were reviewed, and tested. To my surprise, the Denon actually has more power output than the heavier HK.
Although the Denon have higher power output than the HK. But it is the high current that makes the sound very dynamic and clean.
I have a friend that have a Marantz 8300 which is @ 120W per channel. It was still having trouble driving an 86 dB speaker. There is practically no sound coming out from it. But my HK 525, which is @ 70 W per channel still sound much better than the Marantz when driving a 86 dB speaker.
Although, it still lacks the power to make the speaker shines. But this proof that power rating is not very important. It is the current that matters more. That is why, those heavy power amp output a great deal of current to drive the speaker.
Antonio...if you like that warm sound, I'd opt for the H/K.
I had one of the current models (430? or 630?) while I was "in-between" AVRs. They are very powerful (much more than their stats indicate) and very musical.
Actual power vs. Factory rate power… HK is very conservative when rating there receivers while most other manufactures overate there receivers (some by a lot). Also HK rates the receivers all channels driven most do just one.
One thing to consider also is that the Denon has built in EQ. If you don't mind waiting the upcoming AVR635 supposedly will do auto EQ and channel setup as well
I have owned an HK 525 (older brother of the 630) for the past year.
I have owned a Denon 3805 for the past 2 weeks.
I was concerned that the Denon would not have enough power. The 3805 is, to my ears, considerably more powerful than the 525 (though the 630 75 Watts x7 Channels, 90 Watts x2 is rated slightly more powerful than the 525 70 Watts x7 channels, 85 watts x2).
I was also concerned that the Denon would not be "warm" enough for me, as I have always loved the sound of HK. The 3805 sounds very rich and warm, though slightly less so than the HK. It is so much cleaner and quieter, that the difference in warmth is insignificant.
In short, I truly expected to be disappointed in the Denon and want to return it, but, unfortunately for my bank account, I will gladly keep it. It does everything the HK does and it processes the sound much better for home theater. This is not meant as a slam on HK, as I've been happy with the 525. My biggest complaint has been with that the 525 center channel seemed a bit harsh - so much so that I replaced my center channel speaker in order to tone it down. The Denon does a better job.