I have the U2412M and love it. It's the best monitor I've ever used. Especially for something like CAD, which I also use.
Also, despite what's been said, you're unlikely to get a much better frame rate just because your monitor has an extra measly 120 lines of resolution to process. So I honestly wouldn't worry about that too much. Besides, both AMD and Nvidia have options to put the monitor into 1920x1080 mode anyway.