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I'm rather new to this idea myself, but I can give you an idea on the computer side of things.
If all you're looking for is a GPS system and MP3 system with no plan for DVDs or anything then the sound card is not really a concern.
No need to go all out on a 5.1 sound card when MP3's are only 2 channel audio. Video card isn't all that important in any respect... anything sold new today should be able to handle streets and trips (or another road map software of your choosing) and DVD playback.
I would weigh faster ram support and something that supports a decent processor as more important but only for boot time... and there are ways to get around needing to boot up all the time.
In the end, power consumption and ease of expansion is top priority.
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