x3 on Kenwood or Pioneer. I believe that they both offer wireless navigation now. I have 2 Kenwood head units, and they've performed very well for me.
At the time that I purchased my Kenwood, they offered two designs, on the used your phone's cell connection for GPS location, and one that had GPS navigation built directly into the head unit for a higher price. Both units will work well, if you are in an area where there is solid cell service signal strength. However, if you will be traveling where there is not solid cell service signal strength, like off-roading in the boonies, you may want to consider purchasing the unit that has GPS navigation built into the head unit.