Buying ANYTHING non-retina would be a major waste of money at this point. A year from now, non-retina Macs (not to mention PCs) will look positively antiquated. Retina is one of those things people don't really appreciate until they have to use the old technology again. Remember when 1080p started coming out folks were telling they can't see the difference? Well, suffices to say there's no going back to standard def now. And Retina is even more significant, because this quadruples the resolution, widens the gamut, improves the viewing angle, reduces reflections, and makes the already thin screen much thinner still. For all intents and purposes that sensor can't be improved, since it already outresolves the human eye and displays more colors than the eye can discern.
Plus, you get a laptop which will last you a very long time, since aside from the fans there are no moving parts, and the processors stopped getting significantly faster a couple of years ago.
If you want a Pro, don't buy it this year. Tim Cook hinted in an email response to a customer that there are "exciting" pro products coming out next year.