You are limited to your "assigned" dealer in your territory if you are buying a current year (2008) boat. If you are buying a leftover (2007 or earlier), there are a ton of them out there, and you can go to any dealer you want.
You will have to drive a lot anyways, so price out some leftovers, make a killer deal, and find a Yamaha dealer near you for service.
Save yo' money!
I bought my 2520SL as a leftover, and got a great price thousands less than what my "assigned" dealer offered me.