I used to run 1600x1200 on 19" monitors, but I sat pretty close. When I got a 21" CRT, I kept it at 1600x1200, but now I can sit back in my chair and easy look around at my side monitors.
A 19" CRT with 18.0" viewable area is 10.8" tall, so 1600x1200 is 111 DPI. Most people probably think that's too small.
A 21-22" CRT with 20.0" viewable area has exactly a 16"x12" screen size, so:
1024x768 = 64 DPI (blind people should be able to read this)
1280x960 = 80 DPI (you should be able to read this from across the room)
1600x1200 = 100 DPI (comfortable and easy to read from about 2 feet away)
1920x1440 = 120 DPI (have to be pretty close)
2048x1536 = 128 DPI (time to squint)
1760x1320 would be a good for people who sit close to a 21" monitor, but you'd have to use PowerStrip to set the resolution.
And if you're worried about aspect ratio, 1280x1024 is the only standard resolution with a bad aspect ratio. It doesn't have square pixels. I have no idea why so many LCD's use this resolution. Your monitor can do 1280x960, though, if you want a square pixel aspect.