I'm betting you'll dislike the U2711's antiglare coating and prefer the U2713HM by far. I know I did. Wouldn't you still be able to return the U2711 if you bought it recently? I don't think I'd be able to have a dual setup with monitors that look so different.
Neither monitor has arrived; I imagine with they'll both probably arrive within a couple days of each other. I'll set both up and see which one I like better (if I even notice a major difference).