Hi there, I want to buy first Macbook ever. Because of a budget I'm considering only used ones and want to choose beetwen these models: Macbook Pro 13' mid-2012 (i5 2,5 GHZ), Macbook Air 13' mid-2013 (i5 1,3 GHZ) and Macbook Air 13' mid-2012 (i5 1,8 GHZ). Let's assume that all of them has 8GB of RAM and SSD, which one should be more powerful? I think that it should be MBP mid 2012 because of the higher clock rate, but can't find any tests or charts to confirm that. I use my computer to graphic works (2d) and sometimes some movie postproduction.