Hello, I was able to talk down a MacBook Air 11" mid 2011 for $550. Is that a good deal? As of right now I don't have a laptop/computer and short on money as I'm a full time student. I don't plan to do anything major with the MacBook Air beside school and surf the web; I'm asking if it's a good idea to buy it or wait a few months till I save enough money to buy the newest model?