As much as you and many people would like to think there is audible differences in DAC's there isn't. Put a blindfold on and level match the signals and I guarantee you will not be able to tell a difference. DAC's are a mature technology now.
I wouldn't like to think so, so it is nice to know that it doesn't matter.
There are plenty of articles out there that say jitter can be a huge problem.
Even comparing the specs of Yamaha's receivers, say the RX-A1000 v/s the RX-A2000: For the former, the "specs" say that low-jitter PLL circuits have been used, while for the latter it says ultra-low jitter PLL circuits have been used. What is the difference between low and ultra-low in terms of hard numbers? Yamaha (other manufacturers too) doesn't say what it is. Is it just marketing hype? Is there an audible difference?
The point is that there seems to be no reliable way for the average consumer to know these things, which is what led me to this site in the first place.
Anyway, I ended up going with the RX-667. Hopefully, I can finally just enjoy the music.