ALWAYS run LCD's at their MAX resolution. ALWAYS.
ALWAYS run LCD's at their NATIVE resolution IF AT ALL POSSIBLE.
LCD's are different from CRTs. WHile a crt looks basically the same in different resolutions, LCDs do not. They look best in their native resolution... which is usually, but not always, their highest resolution.
Refresh rates are used differently for LCDs as well. On a CRT you want the refresh rate as high as possible to reduce eye strain and eliminate flicker./ On an LCD, high refresh rates lower the quality of the image. When using an LCD, set the refresh at default (60 or 65).