Since the monitor resolution is supposed to be 1440x900, it is recommending a 16:10 ratio. 1152x864 is 4:3, so it will look off. You should look for 1280×800, it is another 16:10 ratio resolution. There is a whole bunch of different aspect ratios, so trying different resolutions, depending on the ratio, would make them look off in different ways (stretches, cutt offs, etc).
Hope that helps.