High quality CDs

But there are loads of used CDs on Amazon and other sites, and among those CDs plenty of Telarc.  And, strange to tell, owners of classical CDs tend to be gentler on their discs, so most are still in very good condition.

Add Linn to the list.

You can't make a direct correlation between record label and quality of sound.

There are multiple variables here: the space in which the recording was made, the circumstances under which it was made (especially time constraints), and all the sound engineering and recording (type of microphones, placing of mikes, recording medium), etc. etc.

So in the catalogues of all those labels you mention, there are at least some very good sounding CDs.

Many smaller labels promote their sound as one of the bigger buying points, so they tend to curate the whole recording process more carefully.  But even then there are no guarantees.

How about Telarc?  Have you tried some of their pioneering discs?