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.