I recently got a third used 1280x1024 for a decent price, and am now running 3840x1024 on my HD 6970 (2GB) video card.
In the modern games that support it, it looks great. In AH I haven't been flying lately since I set this up except for 1-2 offline skin testing sessions, but it works and runs pretty smooth. I couldn't say what it's like in the MA, but I will be sticking with it.