I'm currently using one of the matte aluminum Apple Cinema Displays as a second monitor for my rMBP, primarily for photo editing. I'm calibrating both with a Syper4Pro, which ostensibly means both are accurate. Problem is they don't come close to matching. The Retina screen is noticeably warm/magenta, and the ACD is more yellow/green. It's driving me batty, despite my prints looking fine. Anyone using the rMPB - what display most closely matches it? I'm thinking of getting an Apple LED Cinema Display (don't want the Thunderbolt one, as I need it to work with my gaming PC, which doesn't have a TB port) ... would that match the Retina screen well enough? Any experienced opinions are appreciated.