My workflow is a three display setup. Looking to move to 3 4K displays - at least 27". Mac is used for multiple VM's, coding/compiling, plus general purpose work. There isn't a "need" to move to 4K, other than I stare at the monitors 10+ hours per day and want the best image possible. I prefer the Mac Pro over the AiO iMac for various reasons. What would be a good adapter to drive 3 4K monitors at 60 Hz refresh? Also any recent 4K displays you would recommend?