I would not suggest buying a retina model if you have sharp eyes.
Everyone is diffrent, but Retina screens are far from perfect, and in a case like mine I see all kinds of spots and discoloration in different parts of the screen.
The never ones are a bit better, but they still suffer. It is particularly obvious and annoying to me in dark rooms while viewing darker colors.
Some people can't see the spots, some people can, but it doesn't bother them, and some people like me are deeply annoyed by them.
I have seen some near perfect screens, but it's rare.
Somone took a photo of one of the those type of screens and although nothing was visible to them, a slow shutter speed revealed all sorts of imperfections.
Then there is the potential for burnin.
Also the retina is not a multiple of a standard resolution, so watching a 1080p movie on it will look worse than watching it on a lower resolution hd screen.
Who cares if the pixels on the "Retina screen" stacked are higher than the tallest building. That's a stupid sales pitch if you ask me.
Honestly, what in the hell does retina even mean; it is meaningless to me to name a screen after a body part rather than name the technology and its benefits.
Also, the retina screen does not come in an anti-glare variant, and is not suited for professional photographic work according to the people working at the Apple Store themselves.
The antiglare higher resolution screen, is however a very decent option.
Of course this is just my opinion, and there may be many who disagree.
https://www.youtube.com/watch?v=VHTVizJNKa8&feature=youtube_gdata_player