Hey guys I have spent a good 3 years in the know with car pc's and the 1 that i find to be one of the best in the world today i belive is the sumicom
http://www.kingyoung.com.tw/
look for the s631 I have one of them and they Kick ass small easy to use and you can plug them into normal car power.
from memory you can get them for the 600-700aus doller price.
as far as screens go. all you need is your basic touch screen fold out. stay away from the LILLIPUT as i have had nothing but problems with them.
happy hunting
