You might want to consider this:
http://www.digitalww.com/lilliput_vs_xenarc.htm
The Lilliput seems to have a much better picture to it. Aside from the brightness and basics on the two models though, the xbox would show fine on either one.
I myself just bought this,
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2778063888 , for use with my in-car xbox(running evox with a 80 gig drive installed for all my emulators, games, mp3s, tv shows, movies, even dvds)
And since I am using the xbox for all that I didn't need touchscreen. If in the future I do, I can just buy the touchscreen kit from Armen at Digitalww, a great dealer.
Hope that helps...