I think I'm going to purchase a 15" non retina MBP, and I was wondering how it rates overall? I'll use it for the following: college, so office, aperture, skype, blogging, databases, general surfing, itunes. I don't think I can justify spending the extra $500 or so on the retina. Would you still recommend this machine? Also I don't know if I should go w/ 500 GB or 128 SSD?