Vandersteen 3a signature vs Harbeth 30.2 anniversary

If you like the 3a's, you should look at the Treo's, as well. 
I only mention it because they are in the same price range as the Harbeth's (new).
I owned the 3a sig's before the Treo and can attest to their sounding much better than the 3a sig's.
B

@OP,
If you are working with Johnny, then you are in good hands already.
I didn't know he carried Harbeth. I'll go for a demo next time.

And, if you are open to adding a sub, then as @joey54 said, the Quatro's are probably the 'sweet spot'. I wonder if Johnny can add subs to the Treo's in the demo room? Those little VLR's with a Sub 3 really kick a** with the Belles Aria integrated and the William Tell cables. 
Bob

@joey54 ,
I was there when Johnny hooked up the William Tell's, with Ctsooner.
For some reason, he couldn't hook up the Sub 3, but streamed Qobuz through an Aurender (I think), into a Ayre Codex, into a Belles Aria Integrated. I forget the original cables (Rocket 88?), but the difference was striking. Even without a sub, the VLR's sounded like a floorstander.
Johnny cued up Yello's 'Oh Yeah'. It was so engaging, that I still get shivers thinking about it.
Bob