DVD player for 2006 F150.?

I am looking for a dvd player that can be installed in the area below the cupholder. I have the original 6 disc changer with sirius. I don't wan't to change the head unit because I would have to buy additional equipment to retain the sirius and would lose the 6 disc capability. I like both of these features. By the way this is a family vehicle. I am installing two 7" screens in the headrests so that my kids can see they're dvds so an in- dash unit is out of the question. Any advice is greatly appreciated