When the 13" rMBP was released in October 2012, I sold my mid-2010 27" iMac in exchange for the Retina screen and portability the rMBP provided. Since that time, I've added an iPad Air to the mix which is capable of handling my portable computing needs, so now I'm stuck with a small 13" screen to use at my desk. I want to go back to an iMac but worried now is not the right time for the following reasons. Interested in your thoughts on the 2 concerns holding me back. 1.) A 4K/Retina iMac is likely just around the corner (and I'll want it) so buying a Haswell iMac today is setting myself up for disappointment sooner rather than later 2.) After being in an all-Retina environment for the past year and a half, going back to a non-Retina iMac won't be worth the cost to get one despite the larger screen and added horsepower. What would you do?