There's car stereos for literally under $15 shipped these days. I'm not exactly recommending those models, but car stereos are generally quite affordable and easy to install. Something to consider
But sometimes the integration requires you to have a donor audio CD constantly playing even though you've spliced into the audio feed.
I have predictable functional big buttons and levers to do what I need. The $200 units (let alone cheaper ones) have 2mm buttons and a freaking remote control! Do not get me started on modern car UI :-)))
(fyi it is my 2004 wrx that has a double din cd changer. I go car shopping every year or two, and I stick with my trusty Scooby every time :)