Of course in the end, it is hard to make a purchase with no audition. We don't know your personal taste or hearing. I heard the same difference between the NAD and the AR Complete as Joe_b, except what is "richer" and "smoother" on the NAD for Joe, was "dullness" to me. I actually the same impression of the Rega Planet CD player. What is smooth to many is dull to me.
You'll have to decide what works for you.
The Planet is a great choice if that is your preference in sound. If you want a great lively CD player for $300 to $350 used, then go to eBay now. There are actually three Cambridge Audio CD-6 players up for auction currently. Usually there are none.

