I decided to get both in the car. My car has two options --- everything or nothing for the $2K. So the bluetooth, XM, and nav system. But for that I also got the steering wheel on the correct left side of the car!
I do have to update the map DVD. Goes for $185, probably do it in 2008. Too many new roads around my neighborhood. My brother lives on this big patch of green area. But when you go there its quite a sprawl.