what replaced your Aerial 7B speakers?

IF you can get a deal on a used pair of Joseph Audio Pulsars, they do bass and everything else too. But if you like the way the Aerials are voiced, I wouldn't rule out a subwoofer- there are a million of them out there. Another choice would be Von Schweikert speakers or Egglestons
which get piano right. Stay away from super-resolving speakers IMO.
They reveal the wrong cable or the wrong- well everything. Accurate yes.
Pleasant to listen to? Exciting for 30 minutes, then annoying. Again, my opinion. But Aerials are supposed to be pretty great speakers....

Vandersteen 3A Sigs.

I would like to try the treos. you just can't find them used.

Are you using the Sound Anchor bases and have you tried to move your 7B’s back a little to the  wall? I use a Pass X250 with Wywires cables with Alex’s biwire jumpers with the + lead of the speaker cable on the bottom and the - lead on the top then jumpers. I find the bottom end  on my 7B’s to be outstanding. The configuration of the jumpers make a noticeable improvement  along with the Sound Anchor bases really make a difference. How far off the back wall are your 7B’s?

So, if you have $4,500 to spend on your system, are your 7B’s really the weakest link? I struggle with the idea of changing out my 7B’s except to maybe the 7C’s but I’ve never heard a pair, but my bet is they’re great.