I have dual 21" Dell Trinitrons on my system and while I have noticed the lines when looking for them, they don't hamper my everyday work. I am a graphic designer, so the quality of the image on the screen really matters to me and I don't really even notice the lines most of the time. I got my Dells refurbed with a 1-year warranty from
http://merkortech.com They had a great price, I think like $265 each. They only deal in refurbed monitors. You might want to check them out.