If you were to build a car pc (I'm planning on it) what features would you want in it... Here's what I have come up with so far:

Touch screen LCD
GPS - Any suggestions on software?
Wireless network
Ability to easily plug in external hard drives

I'm in the early planning stages, so I'm opento pretty much anything. This is going in a 95 BMW 318iS - It's a coupe, so there's not TONS of room, but enough to get it done right.