hey guys, from personal experience, get the ones that replace the headrest in the car. A couple of reasons, each child can watch their own movie which is great when one wants to watch Barbie and the other wants to watch ninja turtles, or if you get a bit tricky you can connect them together so that either one can also be the master or slave, ie video out to video in on both. this is good as you can load a movie into each o one and have up to 3 or 4 hours of peace. Another benefit to think about is the wireless head phones that come with these units, great for when you want to listen to a bit of music in the front. I know some people do say kids should do what we did and look out the windows but this is a good break from that as well. Getting to a destination and not having shouted for the last couple of hundred k's is great. Happy kids happy trip.
good luck.
