Hello to all, I was going to buy the Macbook Pro 13 2012, because of the size and the expandability. Now i found an offer for used MacBook Pro i7 2.2 15 2011 for 1300 Euro. My use would be photo editing. The size 13 is a plus but if the 15 would guarantee a much better performance and life of the system i can handle the 15 also. Each of them will be connected to an external monitor and SSD will be added with the Optibay (from my inpo both of the do not support SATA III in the optical bay so no difference there.) What do you think ? Is a good offer ? Does this version have some problem ?