Advice for choosing a stereo for my car?

I'm buying my first car in about a month from someone I know. Right now it has a stereo in it. But it's about 4 years old and the screen is starting to go out on it. It's not really a huge problem, but eventually I am going to want to replace it with something new. And I have a few questions.

1. What are some good brands to look at that aren't too expensive?

2. Where is a good place to look for one?

3. What can you recommend for a price range of about 200 dollars, no more?

I'm good on speakers, the person I'm buying the car from just put in a new set of Pioneer speakers about a month ago. So can you help me out?
 
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