I have the slightly larger EPIA board and run a 400 Watt inverter. The inverter runs everything listed below including the 14" LCD. The shutdown board is only needed if you want the computer to automagically start/stop when the car is started/turned off. I use a momentary push button to start up and shutdown my pc, and a toggle switch to apply/remove power to the inverter. All of the things you meantioned should run off of a 120 Watt or so power supply. They're usually the ones that go in e-machines. That is what I use.