buy it
This is the best computer I've ever used (and I've used many PCs and Macs). The retina display is even more amazing than advertised and has a bigger impact than on a phone or tablet. Beyond the display, everything works so perfectly, smoothly, and quickly. Apps open instantly, track-pad gestures and screen are perfectly synced. It is just so pleasurable to use this computer.
Of course, if you don't need a new computer, wait - like any new model prices will either go down or you'll get more for your money. However, I doubt those changes will be radical and won't be until June regardless. And yes, it's expensive. But I have zero regrets.