It's a good rez to start with on a monitor that size. Kind of ideal but you can adjust either way from there.

If you're just diving into external monitors, the vast array of options and resolution spread before you can be enough to make you give up and buy an iMac just so that your monitor choice is made for ...

I believe the rule of thumb is above 60 or 65 hz is non-interlaced (fine), although 75 is my minimum preference. My 19 runs at 1024 by 768 at well over 75hz mainly because my wife doesn't like things ...