Hi I have a 15 rMBP with a 512GB SSD. I'm tempted to buy a new MBA because its so light. But the new retinas aren't that heavy after all. I know the new MBA has ac wifi, which is huge for me. I know it lacks a retina display and now I'm afraid anything else will look cheap--and worse--bad. I know the air has a very slow processor considered to my rMBP but will it be noticeable watching YouTube, compiling code or light photoshopping. I tend to keep 7+ apps open at a time. How many displays can the MBA power at once in its native resolution of the 27 apple display? I currently have one but will buy another soon... I don't want two personal computers so the air would need to handle those tasks like a breeze. What other differences am I missing between te rMBP and the 13 MBA? It'll help me decide what to do.