Hi everyone, I am planning to buy a new machine to replace my old macbook. As the new model has been released today, choice of purchase has been tailored down to the following two: Option.1: The new macbook air 13'' with 1.8g-i5 and 128G ssd, which I can buy at a price of HKD 8788 since I' m a university student; Option.2: I am also thinking of buying a refurb 13'' macbook pro with the old i5 2.4g, the price of which is 7188. I' m thinking about replacing the hard drive myself with an SSD of 120G, which will cause an additional 1000HKD. Could anyone give me some advice? Thank you so much!