TV's ???

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I wanted to put a nice BIG TV behind the driver... On the headliner behind the driver ( so basically an overhead unit). But I want a dvd player unattached to the unit...

I want to do this for my kids, so they can watch their cartoons in the back... Whats the biggest TV can you put there ??? And if you have one please post pics, so I can get an idea of what to do ... I was wondering if I can get a 19" or a 20" widescreen there...