Do any of you have one of these? I'm thinking of buying one as a gift, but don't really know much about them. Are some (Magellan, TomTom, etc) brands better than others? I'd like to get one that actually says the street names and where to turn. Other than that, I'm not sure of any special features to look for. I'd probably be looking to spend under $500 if possible for something nice. Help, I need it buy tomorrow night!!!