I don't know what there from, but I have had some bad ones here latly and give I give the monitor a break it seems to go away. I'm using some generic lcd monitors called mag innovision
I would recommend VIEWSONIC because I myself use it for last 2 years and it is working fine. I haven't use DELL so can't say anything about it.
DELL 30" monitor, I havent got one, but check youtube out for videos...they look awesome. Make sure you have a dual dvi graphics card..oh, and $1.5k .
I have an apple 23 cinema. it's beautiful. if i could legally marry it I would. but dell panels are pretty much equal in quality for half the price