I've almost definitely decided to get an MBA, but am struggling to decide which one. I'd rather have the 13 inch over the 11 inch, but my questions lie with the processor and ram. I'm confident I won't need more than 128GB storage, so that's not a problem, but please guide me as to which processor is better, the i5 or i7. I'll generally be using the MBA for some web browsing, emails, iTunes, and some web development and design, with occasional photoshop and word processing. Judging by what others have said it sounds like the i7 is only necessary for power-users, but would I notice a speed difference when performing the above tasks? Also, in terms of RAM, is it work upgrading to 8GB? Again, is there a noticeable increase in speed, for example is it noticeably better at keeping more applications open at the same time?