Looking at purchasing an iPad and I have a few questions to help me choose wifi/3g model. I'm not adverse to a JB if necessary, so I thought I'd post the question here. For the most part I'll use the iPad in wifi mode or tethered occasionally to my iPhone. Is it possible to use the iPad as a larger video screen for the iPhone? For example, using the iPhone for gps mapping but displaying the output on the iPad for older eyes. I'd be happier not paying the extra $100+ for the 3g model, but will if there's a reason or potential reason for doing so. Nor do I want to add anymore to my monthly connection bills. Any thoughts would be appreciated. An additional question: does the gps system in the 3G iPad require an actual 3G connection to function, or does it operate independently of the 3G system?