After a lot of back and forth I went with the late-2013 15" rMBP and I don't regret it for a minute. I know, it's expensive but if you can afford and as someone else said here, after you spend some time with the retina display it's hard to get back to a non-retina display, I can tell you that for sure, especially when you work on the high-resolution ratio...you can fit a lot more content at that resolution and is quite useful when you design.