B&W vs Von Schweikert house sound?

I am more familiar with the VR4 JR (I own two pair) than the VSA speakers you listed. You have listed quite a range of VSA speakers. While there may be a house sound, you will hear differences across this group in the attributes you listed. Bass tends to be fairly quick for all the VSA speakers listed, but there is generally more impact and abiity to go lower with the VR5 than the VR4.
I find the high end of the Von Schweikert to be less fatiguing than the B&W speakers and somewhat more forgiving of recording quality. The Von Schweikert speakers also seem to be less amp dependent in achieving optimum sound than the B&W speakers you listed. It is difficult for me to make detailed comparisons because of differences in room acoustics, associated equipment and break-in when I have heard these speakers.
You might find an owner in the NYC/LI area willing to provide a demo of Von Schweikert speakers. Try posting in the Von Schweikert forum on Audiocircle.com if you want to pursue this possibility.

There have been a number of Von Schweikert owners that have upgraded from the VR4 JR to VR4 SR or one of the VR5 versions and were pleased with the improvement. Likewise, few would put the VR4 JR in the same class with the B&W 803 or 802. I do not question there is an improvement, but IMHO you may pay a substantial premium for this in the cost of both the speaker and the associated equipment required to get the best result. In a room that is not too large (my own listing room is 16' X 23' for example) and when the bass module is loaded with shot and the speaker positioned with care and the rear tweeter control set for the right level of ambience, the VR4 JR deliver bass with impact and clarity down to 25 hz as well as excellent imaging, a smooth midrange and very good transient response. Would I trade my VR4 JR for VR4 SR if the additional cost was modest (<$1000)? Absolutely. However, to me it is not worth the several thousand dollar premium the market demands even for used speakers. Your experience may differ.