I'm a college student and will be browsing websites, writing documents, doing excel spreadsheets at times, and listening to music. You know, all the basic things. This is will be my first macbook, but it won't be my primary computer. I have an iMac. I want to buy one of the Retina Display models in Apple's refurbished store. It's a 13 inch retina model with the following specs: 8GB Ram 2.5 GHz Dual-core Intel Core i5 processor (Turbo Boost up to 3.1GHz) 3MB shared L3 cache Intel HD Graphics 4000 128GB Flash Storage All for $1162 OR I can just settle with the new base 13 inch model. But I'm not sure if 4GB will be enough. I mean, is it futureproof?