I bought a new truck today, and I am shopping for a satellite radio unit for it. I'd like feedback from those here that have satellite radio as to which unit and service you use. In my searches tonight I have seen references to a merger of XM and Sirius. Have any of y'all heard anything about that or know of a time frame? Also, I am interested in a GPS navigational system. Any feedback on those would be appreciated. I ran across a Garmin GPS unit that also does XM. Are there any other such units out there?