Vandersteen Quatro CT or Wilson Sabrina

@tomic601 ,
From my experience with the 2wq subs in my home, I do not find the bass notes traveling beneath to the basement, so unless your condo is built with minimal insulation, I think you wouldn't incur the wrath of your neighbors.
Bob

when the new sub comes out...i might try one...

i put 4 mm of cork/ sorbothane down over the concrete floors....

see Casa Pacifica system pictures..for challenge of sub placement,  but right now the sould is sublime....

@tomic601 I have two 2wq subs. in my system and my family used to complain about how they could "feel" the bass upstairs (I am in a dedicated basement room). After looking into the idea of decoupling my Treo CTs and loving the results (clarity, openness) I ordered giant decouplers from Herbie’s for the subs. Wow! The decouplers raised the bottom firing subs. about 1/2 inch off the carpet, yielding what my ears perceived as a cleaner bass response. The most astonishing result was I can play Donald Fagan’s "Morph the Cat" at volume, go upstairs and not experience the bass at all, and that album has kick-butt bass. Huge deal. If you take the leap into sub-land maybe that would be a good solution for your living concerns.

Here’s hopin’!!

As a Sabrina owner, I'll put in my 2 cents that this is a wonderful speaker.  But as others have said, only you can decide which is right for you.

What I will strongly urge, though, is that you arrange an in-home demo of either or both speakers.  I had my dealer bring his store's pair of Sabrinas to my house for a 4 day weekend (paid $200 for them to bring them and take them back - well worth it when considering paying $17,000 for a pair of speakers), and he spent about two hours positioning them and setting them up.  You're going to live with these speakers (hopefully) for many years to come.  Don't decide based on how they sound in a completely different room with very different acoustics, and different source and amplification components.