It's all personal preference. I love 17" LCD's myself, but many older people like the larger font size of 19" LCD's. I had a 19" LCD before and loved the size, but switched to a 17" screen because it was a much newer panel with a faster response time (and I made a couple hundred bucks on the swap as well).
Nobody cares about dot pitch on LCD's because LCD's are fixed pixel displays - each pixel must be a certain size for a specific native resolution on a specific screen. CRT's with smaller dot pitches are better/clearer looking than CRT's with a higher dot pitch, while an LCD with a smaller dot pitch necessarily draws a higher resolution.