Why would you want longer ms? MS = miliseconds, it is how much time it takes the pixel to change from black to white to black again. Basically, the lower it is, the less delay your screen will have.
Ahh... I was under the impression the higher the better. I have not got a monitor in about 3 years I read that on Newegg if I recall right but it was a long time ago so I am not 100% sure.