carputer power supply??

[MZ-N10]

yea there are car to pc power supplys on mp3car but they are all for itx.... well the shuttle is basically a micro-atx form factor so i should be ok.....now i just need to decide on how much power is need....so wat do u guys think i need to run a 3.5" 7200 hd, fx5200 128mb ram, dvdrom, via266 mobo, amd xp-m 2400 and 512mb ddr320 ram....
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[MZ-N10]

well...this is an update...after MUCH research on the mp3car.com forum. i have come up with...

amd xp-m 2400 or 2200(35w)
asus a7n8x deluxe (~25w)
2.5" 60gig hd (5w)
geforce3 ti or ati 9200 (30)
512 ddr(10w)
cpu fan(3w)
keyboard(2w)
mouse(1w)
2 usb devices(10w)

thats 146W exactly at peak enough for a 150w opus