A few things:
LCD will give you much clearer images, especially for line drawings. However, be sure to get one with a fast responce time, as otherwise your greys will dissapear as you manipulate a wireframe (pan, zoom, rotate, etc...)
I personally have a Samsung 243T and I'm EXTREMELY dissapointed in the performance of this exact thing: the ghosting is so bad for shades of grey that it drives me nuts sometimes. It's true that this is one big badass display, and for photos and such I've never seen an equal, however drawing in autocad sometimes is a drag (pun intended).
Another thing to think about is resolution - for me, the more the merrier. At 1920x1200 this screen has alot of real-estate. That means I can fit alot of icons in a small row at the top or sides, and I have alot more definition of wireframes and models. The drawback is that all the text on the screen is alot smaller (but you can fit alot more on at once!). This is definately a personal preference, as some people prefer larger text to more real-estate.
The last thing to think about is what vid card you're using... you'll want one that can handle a high res if that's what you're going for. If you're doing any sort of work in 3D Studio or another modeling program, you'll want a card with good 3D performance (although autocad only depends on the card's 2D performance...).
Hope this helps!
