I agree the Yamaha is a great machine
I bought a yamaha 767 shortly after they come out in August,mianly 'cos I wanted the matrix HDMI switching (which is still relatively uncommon a this sort of price) as I have a projector and a 24" LCD for viewing depending on the programme and the number of folks watching, and having a separate HDMI switch was definitely getting a poor WAF rating.
I'm surprised you also didn't mention the zone 2 facility which some of these amps have. I've found it very useful to run zone 2 to speakers in the next room and be able to listen to the radio via an STB.
The only awkward thing is that on the Yamaha zone 2 only accepts analogue inputs, so I've had to connect up the STB and blu-ray player with ornery phono cables as well as HDMI cables.
I have had a slight issue with the HDMI switch playing silly buggers - when I have both outputs running it is saying something rude to the STB, which then won't output 1080i. Strangely enough the blu-ray player is quite happy. This is supposed to be fixed with a firmare upgrade, but I've not been able to load it as yet. (HDMI is such a huge PITA - consumer benefits, zero, consumer pays extra costs for every box that uses it).
Puzzled by Gideon's comment above - I use a humax freesat HDR and a mythtv PC for freeview as inputs and both work fine on everything I've watched. I suspect the STB must be converting to DD5.1 as this is what the receiver 'sees' on HD broadcasts with surround sound.