Looking to buy a refurb 13mbp retina & torn between a 2.5 v 2012 & a 2.6 v feb 2013, w/256 flash. Is the update significant to merit the $100 premium?

Updating my 5yo white macbook and as per my research I've concluded that my needs will be best served by the 13mbp retina with at least 256 flash. Since the updated version of the retina 13 in feb was released, I've considered purchasing either that or last year's 2.5 model which seems to be essentially the same except for the faster processor. The difference in price is about $100 and I do not know if that bump up in speed is significant enough to merit the $100 difference. Any help will be much appreciated.

Mac

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