Hello folks! First time Mac buyer here and was wondering how much of a difference there was between the 1499$ MBP and 1499$ MBA in terms of performance. I know the former has a better processor, but the latter has much faster SSD and so I was wondering will the speed of the SSD more or less cancel out any benefits of the faster processor in the MBP? Also, are the possible i5 to i7, and 4GB to 8GB ram upgrades worth it on the air? I dont really see myself needing 8GB of ram as far as I know, but Im also hoping to get around 5 years of good use out of the laptop. Nothing more strenuous on the hardware than WoW and maybe Illustrator/Photoshop for photo drawing/editing.