I stopped by the Apple store today, and I'm very surprised I didn't buy anything. That said, the rMBP is a nice machine. The display is gorgeous. But I was not drooling over it. I noticed some jerkiness in scrolling, which really bugged me. Still a very nice machine. Then I spent some time with the 27" iMac. I loved it. However, I really wish websites were optimized to take advantage of the screen width. It looks weird to have them centered. Zooming in can make a nice difference but some of the graphics then get pixelated, which is the only time I would find myself wanting a retina display. The 21.5 is nice but I would want more screen real estate. So, it doesn't seem like there's a perfect machine for me right now. A 21.5" iMac with retina would be pretty great. At the same time I really want the 27" iMac but feel like a complete sucker buying a machine 440+ days into its cycle. Bah.