I want to get a second ipad 2, gave the first one to my wife, but I miss having one. Am having problems getting a 64gig wifi, but can get a 3g 64gig any time i want. I don't want the 3g but its all I can get at my walmart store. Is it worth just getting then 3g and not useing it? Is the 3g any different then the wifi ones, except for the 3g sim. does it have a better gps in it compaired to the wifi ones?