Hello, I'm currently using my MBPr (late-2014) to drive two mediocre Dell monitors at my office but I want to switch to a desktop system so I can leave my laptop at home. One thing that is really important to me is to have the two monitors be identical in both size and resolution. I was initially thinking that I would try to pair another monitor with an iMac, but I think a 27" iMac with another 27" monitor is probably overkill. And it doesn't look like Apple makes a display that would match the 21.5" iMac. Suggestions welcome, thanks!