i`m gonna buy either macbook pro 13" with retina or macbook air 13" upgraded to i7 with 8gb of ram. I`m a student so i`ll take them sometimes to school and also i play games sometimes such as Dota2, LoL, WoW etc... so which one would be better ? cuz it seems that MBA has HD 5000 which they say it is better than HD 4000 in games and other stuff ? please help me to decide