I'm sure you guys are right, but it has been my experience that (out of the box) CRT's look sharper and more natural than LCD's, whether you're using native modes, video cards or not. Having said that, I have never tweaked the monitor settings to death either. I suspect one would have to play with the pixel clock? or other settings in order to get a decent image out of LCD and an Amiga.
And then there is the widescreen aspect, which really sucks with Amiga. I'm about to purchase a 4:3 LCD for my Amiga, but am already anticipating disappointment compared to my trusty CRT.