Mintek MDP-1770KIT 7-Inch Portable DVD Player Kit
you can't go wrong!!!
I recently bought this little gizmo for my 2 sons for when we go on lengthy car trips. I can't say how much of a god send this thing is.  We simply just put in one their favorite cartoons and presto... instant entertainment and a quiet ride. The price is great when compared to some of the other units out there.  For starters it came with everything neccessary to set up in the car including a two way splitter for the two sets of headphones provided. My only complaint is when we periodically lose track of the small credit card sized remote, it's kind of hard to find.  An excellent buy in my opinion though.