Earth computer tech. has a lot of options, and seem to know there displas pretty well.
If you buy from them, you get everything you need.... (cables, inverter, etc) www.flat-panel.com they are kinda over priced though.
If your a do-it-your-selfer, you can get tons of pci video cards with lcd outputs, I see tons on e-bay all the time. but you would need to supply your own connectors and stuff.