Cost does not play into compatability, but screen resolution does, hence at least why I made my particular suggestions. Maybe you could sell your 1920x1200 display and get 3 1920x1080? Whatever you do, I really suggest matched native display resolution.
I'm by no means offended. I was just a bit perplexed with the reasoning. I agree that shopping based on price is important. Matching spec is just as important though. :)
+1 exactly what I was going to say since price seems to be such an issue and you chose your preferred screen already !