^^^ Good point Bobo but the Asus EEE Laptop emeye mentions has a solid state drive anyway.

Emeye, I am sure you have done lots of research but have you seen any of the dedicated car pc's that now offer instant on media players (like some laptops) to get around the issue of having to wait for the system to boot up?
Also with a frontend like Centrafuse you could handle all of the other funtions you mention.
IMHO Installs based around a laptop are likely to be more trouble than they are worth
