Hi there, this is my first post and would like some final advice before I part with my hard earned dollars for a MBP. Now the screen size isnt massively important to me so the main reason for the thread is trying to figure out if at all, how much quicker the 2.4ghz i5 would be than the 2.66ghz C2D? If the difference is not that noticable then I will just stick with the 13" 2.66ghz to save some money. or spend the extra $260 and go for the 15" screen and the 2.4ghz i5? MacBook Pro 2.66GHz Intel Core 2 Duo 13.3-inch LED-backlit glossy widescreen display 4GB 320GB HardDrive $1,269.00 MacBook Pro 2.4GHz Intel Core i5 15.4-inch LED-backlit glossy widescreen display 4GB 320GB Hard Drive $1,529.00 Thanks in advance.