I'm presently a student and am interested in purchasing a MBP. I now own an iMac so I do not need a laptop immediately. I "WANT" to purchase the MBP now but do not "NEED" it until sometime in the fall of 2010. I am looking for advice from those of you who might be more familiar with Apple's history as far as updating their products with new models. So my question is buy now vs wait? Thank You!