AFAIK which is very, very little With CRT's you should get one with the highest possible frequency for your own health (100+ MHz). [That is re: flickering that affects the brain.] And might also affect games re: refresh rate!?! Also check the dot pitch re: visual quality for Hi-D. I think the 19" screens give you an 18" visual area. Though that might depend upon whether it's flat screen or not. I think CRT's use more power & create more heat & magnetic field* (had a mindblock for the term) area. CRT's are obviously much heavier & take up much more space.

With LCD's, their pixels will die off one by one over time. Some faster than others. Beware of the cheapest ones. See what their claims are for pixel loss & what their warranty offers. If you consider an LCD, do as much research as possible to find reports of pixel loss, etc. Find both reviews & user feedback.
The newish apple monitors use 2 interfaces from the monitor to the G. card for hi-end quality. These are rated amongst the best AFAIK but are hi-end for price.

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