what is the 191N? I have the 191T, never heard of the other one. The 191T is good for general gaming, if you are hardcore you won't like it. Saves your eyes if you stare at a monitor all day though.
just found it on monitors direct. I would personally go for the 191T, it has a dvi input as well as analog. The 191N only has analog. Looks about the same spec wise other than that (although I did only glance at them).