does anyone know of a head unit that will play DVD's. it can be either a flip up, with the built in screen, or a regular head unit where you would need to get a seperate screen and a player, such as a PS2. and if you have any advice, is it worth the money to get the DVD option, or just go with something like the pioneer 8600 (now 9600)

 

Just about every majo manufacturer has a line of DVD/LCD units. It is really up to you if it is worth the cost. A top notch deck is ~$350 while a good DVD/LCD unit is ~$1100. Bit of a price difference there for a video set up.