Thanks. I don't see the S720 available here in the UK, looking around at the moment, the Denon 2300w, the Onkyo 656 and the Yamaha 681 are all discounted to practically the same price. I don't see much of a difference in specs apart from the Denon having a few more HDMI ports, which I'm not sure I need, and the other two have phono input and the Yamaha runs cooler. So it might come down to sound and performance, anyone got any idea on this?
Can't say anything about every model you listed, but from what I've heard Denon typically has the best audio quality (their room correction software isn't pretty incredible), followed by the Yamaha, and then onkyo is the known for having a hdmi board reliability issues. Equal pricing I'd go denon, but if you REALLY want a phono in and don't have a preamp for your turntable already, then the Yamaha probably is a good choice as well.