I need to update my home system--my aging MacBook Pro. This time I want a larger screen, so I was planning on an iMac 21.5. I realize changes are coming in the fall, but I need to replace it now. The 27 is just too large for my desk and wipes out the view in my home office, so settled on the 21.5. My main use is just email, Safari, manage my music and photos, and the occasional tweak of some photos in Photoshop CS or Lightroom. Question 1: Is the retina display worth the difference on the 21.5? Part of the reason I am asking is that I had a system configured and delivered, only to have a yellow discoloration in a vertical band just to the left of center. Really visible on any white background. Apple is great on returns, so I took it back. (FYI, this is the first Mac I have ever returned. No iPhone returns either, and only one iPad return . . .) Question 2: Any other retina 21.5 owners out there? How has your screen been? Thanks!