I know this is a deals forum, but I'm playing with the Nav Kit now and it seems less than ideal. You would need two chargers for long trips because of the need to keep the GPS unit charged. If you already have the N800 plugged into your lighter, you would have to alternate. Plus the UI doesn't seem to be the best. I had to input my address three times before I found the "correct" field to get it to turn on the navigational software.

Kinda lame when compared to my Garmin...