As my 1st gen iPad is largely down for the count it's time to shop for something new. THE BIG QUESTION is, do i want 4g. My iPad had 3g, but I only used it once for a cross country trip. The main reason I'd want it if for the GPS functionality for maps. (I like the bigger screen) Now, I have an iPhone, so in theory I can hook the new iPad to that and get the maps working, no? Or would that not work the way I think? (I've never tried the personal hotspot feature). Thoughts? Opinons?