I'm not too sure about the others but my Samsung 500 series that I bought a year ago has been awesome. good frame response clear picture nice contrast looks great for video games. consistent picture across the screen.
I am looking to get a new TV. Here are the choices. Which one to go for and why?
Toshiba 40RV525R 40" LCD 1080p HDTV
Sony Bravia KDL-40S5100 40" Flat LCD 1080p HDTV
Samsung - 40" Class / 1080p / 60Hz / LCD HDTV