I have an iPad 2 which has been taken over by the kids. And while I have an Air, what I really want is an iPad Mini Retina Cellular. I need something bigger than my phone but light with access anywhere. My iPad 2 is wifi only. Would it be worth it to get a used iPad Mini with cellular for $300 or so to use until the iPad Mini w retina arrives (whether that is this fall or early next year)?