Do not know if it is okay to conclude in general about the magic of pairing of CA CDP and NAD amp, although I understand the reasoning behind this philosophy. For example, in my auditioning the CA 640c v2 sounded worse than a Nad c521 CDP with the Nad c320bee amp and same speakers, interconnect and speaker cables. It's needless to say that the nad 542 cdp does even better, but it's at a higher price point.
In my ears, the marantz 6002 cdp was definitely a better player than a CA 640c v2 CDP with the same nad amp.
Above is just my own opinion, based on careful auditioning with my own redbook CDs (with all the other equipments keeping exactly the same).
Gobble, is your statement above based on some audition, or just hearsay? I am just interested to know. I know we all hear differently.