First of all, make sure how much you would like to pay on the car dvd player
Second, what functions you reqire for the car dvd players. Like AM/FM/GPS/ipod function and so on.
Thirdly, go to the body store or search online
Forthly, before you pay it, it is better to try it out first in your car. Since not all car dvd player can match your speakers or subwoofer perfectly.
You can visit Car DVD
which sells head units.All their products have one year warranty.