1440x1080 is a good compromise, if your monitor can handle it. Maintains the proper 4:3 image ratio.
Now if I can only find out if custom resolutions are supported on a GF1-DDR card.. Works a treat on my Matrox G400Max but no one seems to know if it's possible with GF cards/drivers under Win2K. I checked Entech (Powerstrip) and couldn't find an answer on their website.