If you're trying to get the best, I'd have spent that cash on a solid AMP that will have more real world output than the Denon and most likely the Sony in the same price class, not another receiver. I have to say, I''ve never heard anyone say Denon was a "warm" sounding brand.
There are also a ton of options on the Sony. It took me quite some time to configure my friend's 3ES to get it to sound just right, because there are so many options it's actually difficult to set up.