Out of the ones you listed the CD73 is easily the most musical to me. Then the NAD. The 73 is a stepup over the 72, and it costs less than the 72 did new. The Planet was so polite sounding I thought it crossed over to being boring. Generally, people who are really into analog like the Planet's sound.
The NAD is a little forward sounding. But not unpleasant. And you would have good synergy in your system. But if it was my $699 US, I'd go with the Arcam.
The NAD is a little forward sounding. But not unpleasant. And you would have good synergy in your system. But if it was my $699 US, I'd go with the Arcam.