I use an lcd screen with a VGA input. The screen came with the cable to connect to my video card. I bought a 25' extension to run from my trunk to the dash and then some. See the Xenarc, DSCustoms, DigitalWW resellers.
If you're screen only has composite inputs, you'll need a video card with TV out. The text/graphics will not be as crisp and harder to read.
If you can afford it, buy an lcd screen with vga inputs.