Me and my husband are both medical students. I'm an incoming third year and he is an incoming second year. We decided to buy an iPad. we know we don't like the mini for sure. We prefer a larger screen and a retina display. We are trying to decide whether to get an iPad 3rd gen or iPad 4th gen. The difference in price is about $100 dollars. Do you guys think the extra $100 is worth the upgrade. Is it really that much faster?