Professional nav is a must have as it's the main focus point of the whole interior, without it looks a bit plain and cheap. For me the sun protection glass also makes the car look a lot better and it's handy when you got your child/children sitting in the back regularly(not a big fan of aftermarket tinting), also electric folding mirrors as you don't want to spend 30k+ on a car and do it by hand when you get out of it.
