The 7 series received very good reviews. I believe the 7 series are 120Hz models whereas the 9 series are 240Hz. Before you plunk down your money, do yourself a favor and go look at any any 240Hz model that is running film footage (such as from a movie DVD) and NOT video source, and see if you like the look. I personally don't. To me, they make movies look like they were shot on cheap home video cameras, which is due to the quadrupling of the scan rate. You don't need to actually see a Samsung TV as any 240Hz model will do. Just make sure you see one displaying a film-source movie.
Anyone have any buying advice on the Samsung LED LCD TV's? I am looking at the 54" model. What is the difference between series 7 and series 9? I have noticed that the Series 9 TV's are hard to find on store shelves.