I am in the same boat. I want to replace the stock radio/CD player in my 2005 Suburban. I have been looking through Crutchfield. I haven't pulled the trigger because I can't decie if I want or if I need Android Auto. I certainly want the back-up camera and so for that reason I am considering having the radio installed for me.
Do you use your phone for anything besides phone call, navigation, Spotify (or similar), and the occasional message, in the car? If so, don't get/use Android Auto. If I successfully described your use case, Android Auto is very nice. I have a AVH4201NEX (Pioneer) in my Town Car. I'm not sure what I am doing for my '05 Suburban -- yet -- but I haven't seen anything I liked better. I will say that I hate the touch controls on the Pioneer, though; there is no tactile feedback for tapping the onscreen buttons, so you HAVE to look.
Almost forgot! I have the video player in my Suburban, and don't know if adding the Pioneer will allow me to use it or not. One of the PO already swapped out the top end, OEM unit, so the DVD player doesn't do anything at the moment (that I can tell).