Looking at buying my first laptop and strongly leaning towards a Macbook Pro. I am trying to decided between the 13" and 15" model and was wondering if there is a "great" difference between the 2.26 and 2.53 processing speeds. I will use the computer mostly for surfing the internet, downloading pictures, email and music. I will not be running any elaborate games or doing any elaborate desktop publishing. I am just wondering if the additional $600.00 is worth it. I understand that you also get more RAM and HD space but I can always upgrade those later if required but just wanted thoughs on processor speed.