Onkyo Service Center is Hwee Seng at PJ... Soon they will take over service for Pioneer AV/amp as well because Onkyo has acquired Pioneer.
I briefly auditioned the Denon model you mentioned last year before purchased my current Onkyo A-9010 integrated amp. I choose integrated amp because into 2 channel stereo setup only for music only. The Denon on another hand has more bass slam and higher treble on the same bookshelf speaker compared to my Onkyo, which I think is better for movie, but mid vocal lost a little, perhaps it's 5.1 setup requiring center speaker? But since you have subwoofer, bass slam on front speaker shouldn't be a major concern.

Integrated amp only for 2 speaker, for stereo usage. That's why I said I chose the current amp I'm using instead of Denon.