HI, I sold my first generation iPad and went to the Surface tablet, don't like it. I'm thinking about getting a refurbished iPad but don't know which one to get. Apple store has iPad 2 32gb (2nd generation) $309, or 3rd gen iPad 16gb $269 and has a later release date. Then there is iPad with retina display 16gb (4th generation) $299. The iPad 2 has the earliest release date. I'm confused about all the different generations. I'd like to stay under $350. My original iPad I had to connect to the computer to sync and always had problems with things not syncing right. Do all the newer ones sync without having to physically connect to another computer?