I'm building a SFF for a GPS/Navigation system on a friends sailboat. It will be a SFF, but I'm also trying to keep power down. As such, I'm looking at SFF with nforce2 boards w/ built in video. My question is would it be a good idea to put a Athlon XP Mobile in it. Do motherboards readily support it, does PowerNow really decrease power consumption? Or would a cheap Athlon XP be just as good?