The one thing I will say about gaming on a 24" widescreen is that you need the top-end of gfx cards to drive resoutions such as 1920x1200....a 7800GT WILL struggle in most games at this resolution and you can forget turning any AA on unless you have a ATI X1800/X1900....
So what happens if the card isn't fast enough, the game defaults to a lower resolution, and then looks terrible? I have a AIW X800 which isn't going to cut it at a high resolution.