Hope everyone had a great Thanksgiving!
Anyway if you go the Laptop route heres what you use to power everything.
http://www.mp3car.com/store/product_info.php?cPath=21&products_id=60
This device sends 12volt DC regulated power to your DC adapter for your Laptop. It also has the remote wire to turn your AMP on and Off. It also has a contact closure which will turn your Lapyop on and Off. The only hard part is soldering wires onto the laptop power button.
Next you set up Windows to go into standby or hibernate when you push the power button. Walla, you turn on the Solara your Laptop turns on, your turn off your Solara the laptop goes into standby. The Carnetix power supply completely disconnects from your battery when the car is off so there is no power draw. The laptop stays in standby because it has batteries.
Here is the touch screen I have.
http://www.digitalww.com/VVTModule.htm
It acually comes in a palstic shell which I hot glued behind the Solara Bezel.
It seems everyone really like to get there hands dirty here working on their Solaras, well trust me you put one of these in your car you will be unique.