Most all of us who are using a CarPC are using the CD rom for the computer.
You will not find a current model fold out screen that incorporates a CD drive...Xenarc will have one out shortly, but I have no idea how soon.
You cannot use a regular Car Audio head unit screen for this application.
There is a thread around here somewhere where a user modified one of their fold out screens to house the DVD drive. That would be as close as you can get right now.