I did a little research since my last post, and I don't see any sonic differences between the CXN and the CXN V2 as mikijh noted. Just the faster processor and a stated improvement in Internet Radio.
The interface changes are available to CXN owners via a software upload. Frankly, I do not see $300 worth of differences here.
I see some differences between the CXN and 815N most significant in my estimation:
Different DAC Chip set: Twin AD1955 for the Azure as compared to the Wolfson 8740's
Addition of a DC Servo to the 2-pole Differential Bessels on the output side.
More connections, Most notably the addition of an AES/EBU digitial input. Also a 2nd TOSLINK, 2nd Coax digital input.and a 3rd usb port for a memory stick
The DSP volume control in the CXN has been replaced with a SHARC unit, which I presume is an upgrade.
All in all, I am leaning toward the CXN. I do not consider the upgrade to the V2 to be worth anywhere near the $300 price difference.
To me the decision between the CXN and the Azure is less straightforward. The two reviews I read indicate that a noticeable improvement in sound quality is achieved with the Azure. Still, considering that the Azure costs 2.5 times as much, I'm inclined to try the CXN.
Other perspectives are, of course welcome. Anybody heard both?