The NAD C320BEE and Music Hall CD25 combination is magical. Each component brings out the best in each other. If you were starting out with the NAD C320 BEE (or were thinking about buying one), the Music Hall is the way to go (as opposed to the CA Azur 640).
But , you have an Arcam AVR 100 ... right? If that is the case, have you considered Arcam's CD 73 cd player ... they are in the same price range and probably, the CD 73 matches up very well with the AVR 100.
Regards, Rich