Which warm sounding cd player for under $400?

I have a ancient 5355 NAD cd player that been in my system for a year and I think its time for an upgrade. I still want the warm sound with clarity and detail. I'm consider the following players:

NAD C521i or C541i
Rotel RCD-955AX
AMC CDb8 or CDb6

If you have any other conideration please feel free th ask.

Thanks Alfredo