I was in a shop today and looked at some different lcds off course.
First up was an Acer AL922 (I think), the info/price thing said 25ms. I could see some ghosting, not much, but enough for me not wanting to buy it. Which I wasn't planning on anyhow.
Second was an Acer AL712, sporting a 20ms. Here I could see less ghosting, really not very much, but the colors didn't seem right.
Third screen was the Samsung 172S (the one without dvi), 25ms, this actually seemed pretty good. I could not really see any ghosting and the colors seemed good, better than the previous ones.
Fourth screen was a Sony 17" didn't catch the name, but think it was the X72. This reminded me of the AL922, slight ghosting.
Anyway thats my report. What to note here, is that the different 25ms exhibited different levels of ghosing. To me anyway, my brother couldn't see any ghosting on any of them. And this proves, tada, that ghosting is a very subjective thing. So you really ought to find a shop somewhere, what kind of country are you living in. What about those Comets.
But to play it safe, you could go with a 16ms screen, I doubt you would see any ghosting and if you did, you have sensitive eyes. Besides 17" seems fine to me, 19" would be nice though, but only if you sit bit longer away from it.