depends what you are after
CRT
- colours and contrast on a nice CRT cant be beated by lcd's, unless you go for an lcd/plasma tv($$$$)
- if your crt can do 100-120hz refresh rate then you are set, its amazingly smooth. again lcd's can't do that unless your getting a lcd/plasma tv that does 100hz. WHile even 8-2ms LCD monitor does no create any noticable ghosting, it doesn't feel as smooth when you are looking around or scrolling in a game, or even moving a window around in windows. on a crt or expensive tv you can clearly read everything in the window while moving it about, where as lcd you can't, it appears blurry.
If you are really competetive in your fps, then it really helps your aim. (provided you have a smooth frame rate to match the resfresh rate)
of course if you can get a crt anywhere i'd be suprised, don't get a 2nd hand one, colours and contrast will be dead.
LCD
-nice and small and usually have usb ports and other accesories on them if that floats your boat.
-the image clarity and sharpness in the native resolution is amazing. however be aware that if you can't run your games playably at the native resolution which is usually pretty high these days, then your going to have to run them in a lower res, which is IMO lcd's biggest down fall - everything on in native res, becomes incredibly blurry.
of course if you are get an lcd/plasma tv you have the best of both worlds, pefectly crisp image, smooth, fluid images and panning, high res,excellent contrast and colour. only problem is they cost way too much.
Why not wait until NS2 comes out? monitors will be bigger and cheaper, and apparantly OLED and Flat CRT's should be on the market in 6-12 months time. Which have all of the benefits of expensive tv's.
But if you really have to, then i'd go with something like a 19-24" widescreen LCD, with a low 2ms refresh rate. If you aren't a podantic or competetive gamer(for smoothness), then you won't look back. I'd stick to brands like Samsung, or BenQ, but as suggested above, have a look instore, and then check some reviews before buying

and of course we'll need a photo of what you bought to satisfy our inner consumers