Need to update my 2009 MBP Looking at an Apple refurb 13" mid-2012 MBP 2.9 i7. Basic apple warranty. vs Reputable used dealer 15" mid-2011 MBP 2.4 i7. 90 day warranty (same dealer also has a 15" rMBP 2012 2.3 i7) The 15" has better performance specs (I do a lot of photo editing). My questions -- the refurb Apple 13" will have a smaller screen and lower specs but will likely be a newer machine (older design, but newer, more recently manufactured components with less use). I'd prefer the 15" screen, but this is an older machine with more use. Any known issues with the 15" MBP? Would you take the older machine with the bigger screen (I also do spreadsheets, so 15" would be nice) and faster specs, or err on the side of safety with the newer but smaller one? I'd like to get 3-4 years out this laptop.