I have a question for you all. How often do you use your navi system? I'm debating whether to get a Premium model and put in an after market rear camera or go with the Tour/Navi which would include the rear camera. The thing is, I really don't care too much for the Tour but really want the rear camera, however, the price difference between the Premium and Tour/Navi is almost $5000. Maybe if I knew how "often" and how "useful" the Navi is, I might consider going with the Tour/Navi model. Thanks for all your response. . . . .