Late 2013 15" 2.3ghz 16gb 512ssd gt750 2 gb $2039 refurb Vs. Mid 2014 15" 2.5ghz 16gb 512ssd gt750 2gb $2500 Other than the savings of $461? Is there any meaningful difference??? Reliability ??? I'm into photo editing with RAW files. No gaming. Thanks for any guidance you care to share.