I need your expertise I can't seem to make up my mind which to buy. I own an iPhone 4S and a iPad 2. Both are working great. No problems with either. I have owned both for two years. I would like to treat myself to a new Apple product for Xmas and can't decide of the 3 which I should buy. I have a budget of $850. If I get an IPad I would get the cellular model. Thanks for your help.