I've had a 21" CRT monitor for a long time, I finally went LCD when I was given a Viewsonic 19" LCD 4:3 monitor.
The text at the native res was so much sharper then my CRT I gave it away and decided to get a cheap 19" wide LCD for now.
The nice thing about the CRT was infinite black level, no gaming lag at all, and it could do just about any resolution and look great doing it, but it weighed a ton, sucked juice, and the text just wasn't as sharp no matter what res I set it at though it was OK, just not raiser sharp.
LCDs black level sucks, though many newer ones are very good now, the picture is bad at anything but it's native res, and some can have motion blur and lag in fast games, But at the proper settings text is so sharp and clean, they don't weigh anything, and they use much less juice and tend to run cooler.
I find that I spend most of my time surfing and hitting my favorite forums so I spend a lot of time reading text so I decided to stick with LCD for now, I don't game near as much as I used to either.
The best LCD monitors use IPS panels,or PVA, and some of the newest ones also have LED back lighting, hopefully with local dimming.
So you have to decide if you just can't stand the bad side of LCD and want a old CRT or if you want the good parts of it and they outweigh the bad for you.
I'm sure you can buy very cheap, or find somebody that just wants to give away their old big CRT monitor if thats what you decide to do.
My Last one was a Iiyama pro flat tube monitor that originally sold for something like 1500 bucks and I paid 40 for it, and was later offered several Sony ones for free...