So I'm upgrading my 2011 17" MacBook Pro (immaculate condition, if you're interested lol) for a MacBook Air + external monitor, which will give me increased mobility and also increase speed. My question is, I can go for an upgrade of either RAM (4 to 8 GB) or processor (i5 to i7). I do Photoshop work part time and don't do any gaming or other intense stuff. Most of my work is SEO and development. Which upgrade would fit better for my use and what would the differences be? The reason I ask is that now, in a MBP I can upgrade RAM - processor is never something one can swap out oneself. In the case of the Air, you can't do either one yourself, so which one do I go for that would offer me the best performance? Thanks!