For ARC, I would also seriously look at a used LS 3. I have had one in my reference rig now for 7 years.
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I use the Classé 5L for many years too. It´s excellent.
No Levinson, Audio Research, Krell or Sonic Frontiers have the Classé dinamic.
If you like Classé sound and if you really want to upgrade your Classé 5, go to other Classé.
I think that the CP-60 could be a good option.
Although, I still prefer the analog volumen control than digital.