Hey, i just got a macbook 10 days ago so i am still valid for the upgrade. I am a Dj running a program called Serato scratch along with some music editing software. I paid around 2,250 for this macbook and was wondering if i should upgrade to the new 15 inch with faster processor and dedicated graphics or save some money and go to the 13 inch with the 2.53ghz and integrated graphics? Any help is appreciated