I was in a similar situation of whether to upgrade from my current rMBP to the new Late 2013 rMBP. I looked passed marketing, and said nah, I don't think so. What I did for resale value was buy a rMBP BTO 16gb 512SSD, 2.6GHZ i7 from the 2013 February refresh for around $2366(after tax) with back to school sale. Total cost after selling my 2011 MBP, sold for $1500, was $866. Now I bought the 2013 Refresh, not 2012, specifically so that when I sold it, it can be listed as a 2013 model. For the people that don't look into specifications( like us), I figured it will more or less be valued on the year of release. rMBP by this point, is packaged and sold similar to a car model. I personally, won't be upgrading my refreshed 2013 rMBP until there is a minimum a 20-30% performance increase, and possible the release of IGZO or 4k retina displays, if that happens. I feel like the 13in is more of an upgrade than the 15 in. Whats your take?