i've got a 99 tl without navi and i am thinking about buying the garmin streetpilot GPS. i have had it before in other cars so i am familiar with the unit itself, but my question is does anyone know from personal experience or a friend, either way, any good place to mount it other than just the top of the dash. also, if the dash is the only place, how well does it stay on there. some cars have a large angle making it a pain. any info at all would be great. also any suggestions other than getting the garmin.