Initial IDM-1731 Portable DVD Player with 7-Inch LCD
does what you need it to do at a great price
i did extensive research on portable dvd players.  Being a toshiba and panasonic fan, I didn't look much into the Initial brand until I saw the prices of similar players.  i compared the picture quality of the Initial with the toshiba sd-p1200 and was quite suprised to see that the Initial hung in there with the Toshiba, and at almost 1/2 the price!!  Plus, you get all the necessary cables needed to go on long trips (this is why I wanted a portable dvd player)  The sound quality through the speakers is ok, although the toshiba sound isn't any better.  When you use headphones, the sound is terrific.  Plus, this player has an anti-shock system similar to that found in cd players, so it won't skip in the car or when you child drops it a dozen times.  If you want a nice size player (7 inches is plenty big enough for portable) that plays dvd's/cd's, this is by far the best bang for your buck.  I only gave it 4 stars because it doesn't come with all the frills of the higher end players, such as progressive scan, numerous menu options, and the battery pack isn't the best, but it certainly isn't the worst either.  I saw no justification on spending 200-300$ more on the higer end players.  They're not that much better.