he did post in the correct section...
so 1/2 the responses you'll get are that audio in this car is an absolute waste of money. the other half will respond with their specific brand preferences as the greatest thing, and pricing will be all over the board. my post isn't going to be any different
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first, you need to come up with a rough cost where you want to be.
some of the guy's running android units are starting to hit the limitations-- they're all cheap crap, many won't run more than 1 app at a time. i don't believe any of them have removable screens. windows-based carpc's are a better option, but integration fell flat 10 years ago, and now nearly doesn't exist.
personally, i run a pioneer deh-80prs. it does everything i need for audio, looks cheap so no one touches it, but also has a removable faceplate and sd card slot if one were so inclined. it doesn't look the prettiest in the dash, and there's no big screen, but i'm happier that way..