The Super Nait is a good bit better than the Nait 5i. Its not just a Nait 5i with a DAC. It has a different pre-amp section and power amp section. Every aspect of the sound is improved upon. I've heard them side by side (with and without the internal DAC being used), and its not a subtle difference. If the difference is worth it from a financial perspective is a personal thing.
I haven't heard the Cambridge CDP, so I have no comment on which will sound better. I'd guess the SuperNait's DAC, but because I'm a big fan of Naim's house sound and prefer it to Cambridge's. Not that I dislike Cambridge by any means.
The Nait XS is said to be the stripped down version of the Super Nait. It either has the same amp and pre-amp, or is very closely based on it. It doesn't have the DAC and other bells and whistles.
I never thought I'd see the day where Naim has a stripped down version of their own product with less bells and whistles!
I haven't heard the Cambridge CDP, so I have no comment on which will sound better. I'd guess the SuperNait's DAC, but because I'm a big fan of Naim's house sound and prefer it to Cambridge's. Not that I dislike Cambridge by any means.
The Nait XS is said to be the stripped down version of the Super Nait. It either has the same amp and pre-amp, or is very closely based on it. It doesn't have the DAC and other bells and whistles.
I never thought I'd see the day where Naim has a stripped down version of their own product with less bells and whistles!