hi can you tell me if there is a large difference in performance and speed between a 2.2ghz and a 2.4ghz one on a 15 inch macbook pro? is it worth the extra money? i m going to use mainly with after effects,final cut pro,photoshop. i am not using any games. i am going to buy it in like 3 weeks time and hopefully get Leopard as well. can you please advice me which model is more suitable for me ?