In the next couple of days I'm going to buy a new unibody MBP. I will mostly be using it for personal use and design work, and for some gaming. The 17" is advertised as having 60% greater colour gamut. Is there actually any noticeable difference when looking at the 15" and 17" side by side? I don't want the 17" at all, only the 15". Will the 15" display be good enough to use for design work? This will be my first Mac.