Absolutely avoid:

Glossy screens
TN-panels
Low viewing angle

The glossy screens will reflect just about everything there is to reflect unless you´re in a completely dark room, and the TN-panels( which usually are the cheap, low res, low responce time, bad viewing angled monitors) will give you neck pains. For every cm you move your head, the colors will look different.  

Rudolf Herczog
Digital Artist
www.rochr.com