I'm wondering whether the 1,7-GHz dual-core Intel Core i7 version of the MBA is worth the upgrade? Or would be 8GB RAM a better investment? Or even both? I already have a 15" MBP but i would like to buy this 11" MBA for when i'm not at home, or when I would like to sit in the couch at home. It's for writing text and doing research. Ow and occasionally doing some small stuff in photoshop or illustrator. Heavy duty will be done on the 15"