Hello, i'm a graphic designer and want to buy a macbook air, however i'm finding difficult to know wich especifications to choose. I'm mostly working in illustrator, photoshop and indesign.. i dont edit videos... so can someone please advise on which of the following will suite for my needs please: 1. Processor: 1.8GHz Intel Dual-Core Core i5 Turbo Boost up to 2.8GHz or 2.0GHz Intel Dual-Core Core i7, Turbo Boost up to 3.2GHz 2. Memory: 4GB 1600MHz DDR3L SDRAM 8GB 1600MHz DDR3L SDRAM 3.Storage: 256GB Flash Storage 512GB Flash Storage Thanks!!