I am currently using a 2008 Macbook aluminum unibody. I am looking to upgrade sometime soon. I am unsure if I should go for the Air or Pro retina 13". I mostly use my computer for school, but occasionally do some light gaming such as Starcraft 2, Civilization, and Diablo 3. For the Macbook Air I would upgrade the processor to the i7 and RAM to 8 GB. I need 256 GB SSD. Comparing this model Macbook Air to the base Macbook Pro Retina with 256 GB SSD, there is only $100 difference with education pricing. What draws me to the Air is its portability and the fact that it has the new Haswell chip and I would receive the $100 giftcard. Opinions?