The Dell 2709W outclasses that samsung in just about every way. I looked into it for about a month before choosing my one. But the dell is a bit more expensive, and has some slight input lag. But it has a much wider viewing angle, much better colour reproduction, better stand, better contrast ratio etc than the Samsung.
I dont know about the Hanns-G one slaymate has, they dont supply to us - so check out some reviews from that one as well.