Naim CD5x versus CDX2

Hi folks. I'm interested in hearing from those who have experience with one or both of these units. Basically, is the CDX2 worth the extra dough? Also, I'm curious about where each of these can be taken with additional power supplies--XPS and Flatcap 2. For example, how would a CD5x with a Flatcap 2 stack up against the CDX2, etc.

Thanks!