If you mainly do word processing you may wish to stick with a CRT as they display text better than an LCD, although some people may not notice the difference if their eye sight isn't all that good anyway. What you want is a CRT with a high refresh rate 80+ MHZ generally doesn't have any noticeable screen flicker, but some people may still see a little bit, but 100 MHZ looks as good as LCD as far as that goes.
Since most LCDs are limtied to 1024 x 768, you may lose some screen real estate if you are using a higher resolution, which could lower productivity a little bit.
The main advantage of LCD's is they are ligh weight, take up less space, and use less energy. But they are not superior to a CRT monitor as far as picture quality goes.