Heard nothing but good things about the Denon. Can't go wrong there. If you don't have any analog signals to upconvert, the Sony is super budget. I've had a Sony receiver for 17 years and it's still running strong. I put that thing through abuse too. I'm not a big fan of just 2 HDMI inputs on the Yammy. I have three components using HDMI and will probably need more in the future.
So I say go with the Denon if you have the money, the Yammy for middle of the road (only if you have 2 HDMI components), and the Sony for a budget option. Some might say go and purchase an HDMI switch for $50 but that just defeats the purpose of switching everything through one component, in this case the receiver. Plus, that's $50 that could go towards a different receiver.
Another one to consider...the HK 254. $390 on Amazon right now. 3 HDMI inputs, hi-def codecs, upconverting and repeating HDMI, sexy, and a good clean sound.
I'm trying to choose between the Denon and the HK.
Good luck!