Hey, I need a new display. I was thinking of going for a 27' apple led display, used for around $750 or $800.... ...but then I see that 27" imacs of a similar vintage, circa 2010-2011, are sometimes going for THE SAME PRICE. And these are imacs that can be used as external monitors, no? So I ask you all wise mac peeps... WHY NOT get a 27" imac and use it as nexternal monitor sometimes, and an imac othertimes? thanks! r.