I bought my macbook pro in early 2007. Just recently, I have the chance to upgrade to the uni body version. I'm torn between the 13" and the 15" with the extra video card. I'm in college and do quite a bit of photo editing. I have a 30" ACD that I edit on. Will the little mac have enough power for that? Should I fork out the extra money for the 15"? Thanks for the help.