Several of us with Magnadynes in the 2012-2014 era went with Kenwood. I went with their DDX470 model, which does not have GPS. Install did require a lot of wire splicing. We are happy with it - after about 5 years, a couple hundred nights camped, and probably 60K miles. That model Kenwood I believe is no longer in production, but I am sure there is a more recent version available.
I added a Garmin 760 LMT stand alone GPS.
2012 Solera "S"
Calif SF Bay Area