new head unit for 2016 - what do i need?

All i can think of is carplay and inputs for two cameras. i will probably also get XM and the accessory to show vehicle info i have had carplay in many cars and wired is fine to me. I will add amps and a sub but anything else I am not thinking of for a head unit before i order one? I will probably stick with the stock size unless there is a reason to get a bigger one. thanks in advance. OI like Kenwood and APline but pioneer seems to be a good value as well.

 

MaestroRR, dash kit, antenna adapters. I think Crutchfield will list everything for you. They have live chat as well.

 

Thank you! are there any other head units features that I am not mentioning that i might miss? I only want to do this once lol