Hi I'm getting an Auris HSD next Friday, without a built-in sat nav. I could go for a unit such as the Garmin 3790T, but I don't want to attach to the screen, as it will leave a visible mark, nor do I want to stick it to the dashboard. Any other non-destructive ways to mount it, or a similar device? Or, I could go a built-in device. Any recommendations, that fit nicely in the dash? Or, I could get a smartphone, but again I need to mount it. Any ideas? Rich