I've worked with several LCD and CRT monitors.
In general, an LCD is much more expensive compaired to the appropriately sized CRT. However, and LCD run in the mode it was built to support natively, or an even multiplier of that, will look very good. Modes it doesn't support as such tend not to look as good due to pixilation however.
An LCD tends to be easier on the eyes as it is a flat screen. The exception to this are the CRT Trinitron monitors (I love my 19" Trinitron). Rounded screens, even if slightly so, do distort the immage a bit, especialy if you are looking at the monitor from an angle, and can cause some eye strain.
My personal oppinion, is that unless you are buying a top of the line monitor (LCD or CRT), you are better off actualy having seen the monitor in person.
You want to look for things like Refresh Rates or Latency (CRT or LCD), maximum resolution, recomended resolution, keeping in mind what resolution you like to use. A high end 15" monitor can look better than low end 17" and even 19". My first 15" was a trinitron, I ran it at 1024x768 most of the time with great refresh rates (Rated better than many low end 17" out today). It even did 1600x1200, although in interlaced mode.
Remember, a good monitor can last you 5-10 years, so don't be afraid to spend a little extra.
I do not like it Tom you see,
I do not like green PCB.