I have a new car with in-dash iPod steering wheel control but no GPS. Though I have a 16GB iPhone, Google Maps is not very practical while driving. Enhanced GPS capability is rumored to be included with the next round of faster iPhones. I am not inclined to replace my current one until 2009 (every other model). However, this brings up an interesting dilemma. Since a good GPS with large screen could cost as much as an iPhone, would it make more sense to upgrade iPhones this year than purchase a separate GPS unit? On the other hand, assuming the iPhone implementation is not much better than what we have today (perhaps more accurate dynamic current location indicator), what is a good GPS for use in the U.S. that perhaps includes real-time traffic alerts, audible directions, and automatic detour routing?