I noticed today that there is a February 2011 15" MacBook pro for $1229. Also, there's an October 15" MacBook pro for $1359. I'm guessing both are sandy bridge processors with only a 0.2 Ghz difference between the two. Is that a noticeable difference during regular use? I'm going to be a medical student so I was looking for a 15" MacBook to use for Atleast 4+ years. It'll just be used for Internet, PDFs and writing. 15" screen size and Battery life are the most important factors. Do you guys recommend those models? I would love to get the retina MacBook or even a the refreshed 15" unibody MacBook pros but I don't think I can justify the need to spend over $1700+ for the basic uses described above. 1) What would you guys recommend? 2) How long will it take (estimate) before mid 2012 unibody 15" MacBook pros or retina MacBook pros show up in the refurbished section? 3) How likely is it that I will receive a scratched MacBook if I buy the refurbished one?