I would look at the manufactures website and see if there any brands that you have interest in currently not available in your area. Make a list of the dealers, it is a great opportunity to hear and see something that you normally can't in your area. As a final note I know a local dealer here in Colorado that does a fair amount of business with "tourists", I say let the dealer decide if he want's you in his store or not.
Road Trip
My wife and I will be taking a road trip in October. We will be staying in Bowling Green, Kentucky and Memphis, Tennesee. If anyone knows of any high end stores or used record shops in those areas, kindly speak up.