Koss DVP2161 Compact DVD with MP3/CD Player
Best Portable DVD Player for the Money
Let me start off by saying that I love these little dvd players.  I currently only have one, but I am going to get at least one more if not 2 more.  I don't know why others seem to have problems getting it to play certain dvd's.  Mine will play almost anything I throw at it.  I use a lot of VCD's and it will even play non-compliant vcd's. Heck, you can just burn your video file as a data file onto the disk and this thing will play it.  You can burn JPEGs to a cd and it will let you view them.  It plays stuff that 300 dollar dvd players won't even touch.  As far as the overheating thing goes, just be sure to prop it up on something and don't sit it flat on carpet or other surfaces.  I intend to build a special frame for mine in which I will mount a pc type fan in the middle for even more ventilation.  Buy one of these and a small LCD display and hit the road Jack.  These are awesome.  Kudos to Koss, they get my 2 thumbs up for this product!