I can help narrow it down...choose between Kenwood (I had two units at one time...before my 80-series got totalled), JVC and Pioneer. Outside of that you're going to find things lacking.Any recommendations for Double Din Nav Systems? It appears that I am in the market... I have already purchased speakers, sub and amp.
Personally, I'd be looking at the Kenwood Excelon because it has native controls for USB Mass Media devices...aka my Fiio X5. I don't use navigation with the unit I have anymore because I get better from my android phone.