In my experience, these screens have a slower refresh rate than a standard monitor. This makes them fine for day to day computer work, but animation can appear to be disjointed or jerky...
Take some Poser/Vue animation samples to your computer supplier - get them to run these on a computer similar to the one you are considering buying. This will allow you to see how your animations look on the screen model(s) you are interested in.
The newer model screens are getting much better and faster (and cheaper), but you are entitled to make sure you are happy with the results first.
Also, if you will be watching movies on your new computer, ask to see a DVD running as well.