Sorry I didn't see this before but Marantz and Denon are owned by the same company D&M Holdings
They share a lot of components and are both great in my opinion.
Don't be so concerned about the lower power ratings. Denon, Marantz, and Harmon Kardon as well as some of the other lesser known brands, tend to be more accurate in the way they rate their power, as compared to the others that spout off exaggerated numbers.
That said, hope you are happy with the Sony, it does seem to have a nice list of features.
Sometimes when I reflect back on all the beer I drink I feel ashamed. Then I look into the glass and think about the workers in the brewery and all of their hopes and dreams. If I didn’t drink this beer, they might be out of work and their dreams would be shattered. Then I say to myself, "It is better that I drink this beer and let their dreams come true than be selfish and worry about my liver."
-by Jack Handy