I have a Pioneer EVIC nav radio. It's a good system. XM and Sirius. The navigation leaves something to be desired though. My Droid phone is much better at nav so I us it. I mostly got the radio for the back up camera since I can't see anything with a lifted truck and a camper top. The newer pioneers have improved some. Mines a few years old.
I have a new, in the box, Kenwood DNX7140 if it will fit someone's truck. It doesn't fit mine.