Be careful with showroom auditions. The room will be nothing like your home, so it could be turn out totally different in your own room. Also, the speakers are not all at the same spot in the auditioning room. This also can make a huge difference.For now, I only have done a quick listening in a big store where there is a dedicated space some months ago (I go there for another thing, so I just pass quickly). I only listen 3 speakers but I don't remember which model and with which amp it was. I notice that the Focal model was far more present than the two other (triangle and dali I think) with the same amp, with far more bass (maybe to much). I will try to listen some models. Focal could be easy to find for listening (in France), KEF or Monitor Audio will probably be harder.
As for amps: that should not make significant difference if the tone controls are set to flat.
What does make a huge difference is the volume. You wil need accurate matching between the speakers for a fair comparison. Usually that is not very practical in such a room.
Next, beware of the “showroom sound”, that may be euphoric at first, but in the end, at home, it will get old very fast.