Amp match for Wadia and Harbeths

I've recently taken delivery of a new Wadia 381 cd player and am now looking to find a suitable amp to partner it with my Harbeth monitor 30s.

I'm aware that some prefer using the built in volume whilst others prefer an active linestage. I'm specifically looking to hear from people who have found great amp match ups when only using the built in digital volume of the Wadia.

My budget is a max up to $7000 new or used . I listen mainly to classical music at moderate volume levels . Room is 17' x 14' x 8'.

Also as well as obviously the sound quality being paramount. I'm also looking for something with a certain iconic and classic quality that will be something I can own and be happy with for the long term. Just examples that come to mind would be say in SS , Nagra PSA (pyramid) Boulder 860, Pass Labs aleph 0 or Conrad Johnson Premier 350 or in Tubes: Mcintosh 275 , Airtight , Shindo or Viva.

I plan to audition as much as I can first ( starting first with the Nagra PSA and Mcintosh 275) but of course will not be able too for everything so any pointers and real hands on advice would be really appreciated.