[coreymgilmore]

I would always spring for the 15". The larger screen is hugely important to productivity. For example, split screen Sublime Text editing or having a browser and editor side by side. That, for me, is one of the most important aspects.

Other hardware consideration: faster is always better as is more RAM and a larger SSD. But, obviously, stay within your means. I personally use an i7 2.3 with 16GB of RAM.

Edit: If you intend on multi-monitor usage via the thunderbolt/display ports: the nVidia GPU is pretty necessary to push multiple big screens.

Last note: the refurbished MBPs are a great deal. You get the full 1-year warranty and a fully tested and clean laptop for a few $100 off the original sticker.

[chrisBob]

I have a 13" MBPR, and I just plan to use it with an external monitor all of the time. Even 15" seems small. I figured most people with laptops as their primary computer attach a display unless they are on the go, so the 15" might not make too much of a difference.