One thing to consider if you do use the Cambridge CXN to do the digital-to-analog conversion: although it has balanced analog outputs, the Rotel does not have balanced input, so you will need to use unbalanced cables. Thus the relative weak analog signals out of the CXN will be vulnerable to RF interference, which could hurt SNR if you live in a RF noisy environment.
To avoid this problem, it would be better to get the CXC CD player's digital output directly to the Rotel via an optical output. (Yes, this contradicts my previous advice). Also, once the Rotel amplifies the signals, they will be much less vulnerable to interference, so using balanced cables to get the analog signals to your speakers is a much lower priority.
But again, most likely there won't be an audible difference whatever choice you make, and if you are energetic you could wire it both ways simultaneously, and use the Rotel to switch back and forth to see if there is any difference.