Display size is meaningless without resolution. Despite 1280 x 1024 at 19" serving you well, it's very limited screen real estate compared to most modern displays. With 2560x1440 you'll fit much more content into the frame, but at 24" it will be rendered smaller than before. Personally, I think 24" is too small and such a resolution is ideal on a 27" display.
thirdsun, much appreciative of your reply. Question (and yes I am a noob). If on the 24" the content will be rendered smaller than the 19in, why is a 27" display ideal? Why wouldn't the content be even smaller on a 27" ?
Clearly, I am not understanding something. Thanks again.