Ok so I see quite a few of these while searching but I have to ask anyway. I'm in the market for a new MBP and can't decide which model to get. This will be my first Mac. I will primarily be using it for pleasure, not trying to meet any deadlines on projects. The most horsepower I need will be editing GoPro HD footage. I ride and race motorcycles and like to put together videos from the adventure but the 1080p HD seems to require some muscle. I initially was leaning toward the 13" because of portability but wasn't sure if I would notice a difference between the 2.4 or the 2.66 gpu. But then reading on here I got worried about taxing the system with video editing so I might need the 15 with the i5? Bottom line, what's the cheapest I can get away with and still have sufficient power to edit efficiently?