I have been editing with two monitors for a couple years now using CS6. I typically use the 2nd monitor as my timeline monitor, freeing up space for the clip monitor and the time line. One is 24" and the 2nd is 21" I can add one more monitor if it means that I can use it for something effective. I was thinking of using it in portrait mode with my Bin & effects window. This set up would be for editing. I have yet to figure out a 3 monitor system for color correcting. I would like to hear how you have your set ups and maybe even some photos. I just want to have an efficient set up and I feel in my video editing that the more real estate the better.