I'd go for the LCD. After using LCDs for over a year now, I can't stand sitting in front of a CRT for very long. I have the Dell 1800FP and I definitely wouldn't trade it for a 21" CRT.
I used to run my CRT at the highest refresh rate possible, but my eyes would always hurt after long session in front of the computer. I get the same feeling from sitting in front of the TV for too long. I found that with my LCD, I don't get that anymore.