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Keep your eye on ebay for an OPUS or m2-atx (there's one of the latter on their now.) Buy an old usb GPS puck, a 20quid 1Ghz base unit and spend a decent amount (75-100quid) on a new Lilliput or Xenarc touchscreen (that's the bit you can't save money on, so don't try.)
You should be able to get a cheapo system up and running for under 150quid (screen included), depending on wiring, amps, speakers and what computer kit you have lying around.
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