I think that the recommendation to attend RMAF is a good suggestion. Dealer inventories and demo stock is very light because of the economy; you will be lucky if you can see or hear all of the specific brands and models you have listed in a given geographic area.
While Southern California is a good choice, I think that the San Francisco Bay area might be better (note - I live in SoCal). There are more high end dealers in a smaller area in the Bay Area, and Southern California dealers are, let's say... unique in their approach to customer relations and sales. This is not a universal pan of SoCal dealers - Brooks Berdan, for example, is a great guy and treats his customers well.
While Southern California is a good choice, I think that the San Francisco Bay area might be better (note - I live in SoCal). There are more high end dealers in a smaller area in the Bay Area, and Southern California dealers are, let's say... unique in their approach to customer relations and sales. This is not a universal pan of SoCal dealers - Brooks Berdan, for example, is a great guy and treats his customers well.