That's more powerful than the laptop in my car, which does GPS and OBD stuff just fine. (It has no trouble with music either but I'm still using my car's factory stereo.)
You'll want a way to power it - I'm using a 12v-120v inverter, and the power supply that came with the laptop, but will be switching to a 12v power supply from http://epowersupply.us eventually (received it a while ago, haven't wired it up yet).
I'm pretty sure Centrafuse or RoadRunner can do everything you need, though I have only used RR briefly and seen CF in a friend's car.
I suspect you need to ask questions about something specific.