With the 15" Retina MBP making it's appearance today, do you guys think it would be foolish to purchase the 13" now? I believe it's only a matter of time before the retina makes an appearance on the 13". Probably in the next refresh. I am in need of a computer for school this fall, and can not justify a $2000 computer for email, writing papers, iPhoto, and iTunes. Any thoughts are appreciated.