Hello, long time reader, first time poster here on MacRumors. Anyway, I'm going to be upgrading my aging white 13" MacBook (circa 2006) very soon. Question I'm wondering is what MBP model to get, the 13" or 15". I know any upgrade will show a MASSIVE improvement over my current C2D, but that Quad core i7 in the 15" just sounds beastly so I'm tempted to pull the trigger on it...I'm just not sure if it's really needed for what I do. I do occasional video editing, LOTS of photoshop and image work, little gaming, and other typical stuff. Given I don't really need the dedicated GPU, what do you guys think? Is the quad i7 worth paying for over the dual i5?