At 24 inches it will be pretty much impossible to tell the difference between 1920x1200 and 1920×1080. Keep in mind that when the Xbox runs at 1080p it is really just upscaling the image which further negates the difference between the two resolutions. If the cost between the two monitors are the same I would pick up the 1920x1200 for a slightly sharper computer image, but if the 1920x1200 costs more then just a few dollars more then the 1920×1080 then I would just forget it and grab the cheaper model.