I would agree with the others on both LCD being nto good on the cheap side (apple ones i've been quite impressive with colour wise- and i'm sure other third party high end lcd's are similar)

Does he want to be able to move around the monitor as well as the laptop? If he wants something mobile then that may limit the range to LCD's and 17" CRT monitors.

If he doesn't want to move then do look out for the quokka specials as Mark said. I got some IBM 21" monitors for $350 each for graphics work and they are actually beating the G520 i purchsed new for >$2000.

I cant' comment on the new CRT qualities though as i haven't looked into them at all. I would say and new monitor will be fine for a while. They may die a bit quicker but second hand better monitors have already lost some of their life span.

Wez