well, i would suggest either a 7" widescreen vga screen, but that might not really be big enough; or a 8-12" lcd that runs from a controller card. someone in the forsale forum is selling controller cards right now, and you can pick up lcds on ebay for not too much.
heres the thread in the forsale forum:
FS: LCD Controllers - $90.00+shipping
good luck, check out different posts here, theres a lot of info here already.