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Are you going to be using a desktop motherboard or a via-type motherboard? When completed, I will have all of that (except FM transmitter) plus the monitor running on a 160 m2-atx power supply, along with a via-based board. Most of those components don't use too much, it's just that the most power-hungry item is the motherboard / processor.
There is no harm is going above what you need. The largest dc-dc intelligent auto power supply I have seen is 320watts, which is a lot of power for our environment. Take a look at the selection in the mp3car store under "power supplies" to give you an idea of what's out there.
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