I use a Samsung 19 inch LCD as the primary monitor nowadays, but the catch for photographers with all monitors, is colour calibration. I use the Spyder2 Pro which sits upon the screen whilst the software fires known values of colour at it and the Spyder itself, picks up the colours, measures the difference between what it sees and what it should be seeing - and then applies a correction curve to the video card, giving consistent and accurate colour on screen. This can be used with CRT and LCD monitors and is a must if you need accurate colour.
Most 19 inch LCDs native resolution is still only 1280X1024 (Ordinary, not widescreen format) and so you won't get as good a resolution as from most CRTs. But they are dropping in price and picking up in performance every month. I would avoid anything with a slow response time, but there aren't that many slow LCDs out there these days.
Conan