If you work allot with graphics and need more accurate colours ,a CRT is probably the best display to use.
LCD monitors are now becoming as good as CRT's for all other uses.
LCD's use less energy, take up less space, easier to move around and give a sharper image.
OK eventually the backlight will become worn out and you will get more dead pixels but a CRT will also degrade.
I have both 17'' CRT and LCD monitors ,when I compare them I am surprised how badly the CRT looks.
The LCD has a much sharper image.
If you are going to use it for gaming, try to get a LCD with a responce time of 16ms or less.