Seems like deja vu all over again, this time instead of the Onkyo TX-SR706 (or 705), it's the Yammy 665. And from the Denon 2309, now it's the 1910.
Mike, you're a Denon man, and you should recommend your buddy a Denon receiver, period. After all, you know best.
For places that are Denon authorized dealers, there are tons of them, just like Josten already said. And I know that I did give a guy, in a thread in this Forum, more than a dozen places, all the best ones. But I ain't looking for them again.

Just too many posts to check over. Anyway with the three from Josten, you should be fine.
As for the HDMI do and can't do, just go over Denon web site, it's all there.
Finally, tell your buddy to get the Denon AVR-1910 period.
Cheers, Bob