Panasonic DVD-LV75 Portable DVD Player
I am in love with this player!
Just for reference, I also have the Panasonic LV-50 portable and the Pioneer Portable. This is head and shoulders above the others. The screen quality is fantastic. Very crisp. The controls are greatly improved over  the LV-50. The toggle which allows the LV-75 to act as a monitor for a  video input has been changed from a very fragile slide switch (I broke my  first LV-50 because of that stupid design), to a little button in the back  of the player. With the battery, my kitchen scale reads 2.7 pounds and it's  still just an inch thick! I have gone through 30, or so, disks and have not  found any problems reading. If you're looking for the best portable out of  the bunch, this one seems to be it.