I'll play devil's advocate - while the Retina MacBook Pros are obviously the future and have the most modern technology, if you are able to take advantage of some of the discounts (edu, refurb, etc.) on the non-Retina 13" Pro models, they're still being sold by Apple so support should be for awhile, still are plenty capable (other than the screen, SSD, and optical drive differences, they have a lot in common with the 13" rMBP that was sold until October), and are still offering similar technology as the Mac mini (same GPU, similar hardware).
That being said, the decision about a year ago was a little tougher. Now, I'd lean towards a rMBP or MBA, but the non-Retina models still have their place, especially if you can save some money. Finally, if you don't have the cash to get a loaded or higher-end rMBP up-front, the non-Retina model can be a good "starter" machine that you can later upgrade RAM and add an SSD. They're also very easy to repair most things on (I speak from being the go-to unauthorized repair person for a lot of friends and also being responsible for at least a couple of Mid-2009 and Mid-2010 models being in use for a bit longer). 🙂