No matter how many dealerships you visit, how many audio "festivals" you attend and how ever much time you spend doing it, in all likelihood you wouldn’t be able to audition even half of what the market has to offer. Moreover, many dealership rooms are setup like crap and may not have in use the other gear in your system. So even if you do have an opportunity to audition the speakers on your short list, you should only give so much credence to it.
As the Grateful Dead would say, you just have to make sure you leave no left turn unstoned.