I don't understand why so many people claim that plasmas show SD better. After a lot of visits to stores , houses of friends ect. my conclusion is that good LCDs handle SD equally good with plasma plus they don't have annoying screen reflections. Furthermore 9/10 plasmas cannot even show 720p (=1280x720) since most of them have only 1024x768 resolution.
Last but not least plasma screens produce electromagnetic fields which can be dangerous for the health while LCDs don't.
http://www.electrosensitivity.org.uk/powerwatch.htm