Hello! Im a college student and I absolutely need to buy a computer in august (my mom is traveling to the US to buy me one). I have been saving my money and i have these options: ($900 dollar budget) A 13 inch macbook air for $856 4gb 128gb A 12 macbook for $856 (new) 2015 model 8gb 258gb A 13 retina macbook pro for $914 (used) 2015 model 8gb 258gb I need a computer that lasts me 3-5 years. My mainly use will be excel(medium to heavy sheets) microsoft, net browsing and very light photoshop. Im a little afraid about the lighness of the rMB (its easier to break it) so i still have the MBA as an option. Also im not so shure about buying a used computer... I know that there could be a new rMBP later this fall but im afraid I cant wait more time. Which one do you think i should go for? Thanks!!