Most small LCDs only support 800x600. If you want to go a cheaper route and if your videocard has S-Video you can use a cheap TFT display like the old Playstation LCD or a LCD from a portable DVD player.

If you want to use a VGA style LCD make sure you have a videocard that has dual VGA or DVI and VGA or you will need a CGA Y cable and the video would be mirrored.

If you do end up using a LCD for automotive use toss on a 3 or 5amp fuse onto the 12volt lead for protection.