These are all good. Just take a look at the response time. 2ms I believe is the better of the two response times. I forget. I would probably narrow down the list to either the Samsung or Viewsonic because of my experiences with these companies and the quality.
Also, check what hook ups they have. HDMI, analog, digital. My Samsung has analog and digital. HDMI is for digital TV. At least that is what my digital TV has to run digital signals. I did not get HDMI because I will not watch TV on my computer monitor. I have a 37 inch widescreen for that. For the full effect of the LCD monitor, go with digital hook up. Just make sure your vid card has digital output
You will notice a difference between analog and digital.