(One time, about three years ago I was fiddling around in Display on my old 17" moniter. It was on 1280x1024, and I wondered what 1600x1200 would be like. Amazed afterwards, I never went back (and since upgraded to a 19")
You'll find the refresh rates drop as you raise your res though. If I go that high, my refresh rate will be stuck at 60hz. As is, I can have it up to 85hz. Better for you eyes.