Tempted to buy a new fancy flat-screen TV? Don't be.
Read the Goodbye CRT article that was published in IEEE Spectrum. The article was written back in 2006, but its description of the pros and cons of plasma and LCD is still very good. As you would expect from IEEE, it gets the technical details right and without marketing bias. Read through the article and you will learn why the classical Cathode Ray Tube (CRT) is still the best quality picture for your money.
If you still want to get a new TV, then ignore the specifications the manufacturers publish. The Display Myths Shattered: How Monitor Companies Cook Their Specs article tells us they are all grossly exaggerated and really don't indicate how good the display is for actually watching videos.
As for me, I'm sticking with my CRT!
Update: the surface conduction electron emitter display (SED) technology, described in the 2006 IEEE Spectrun article, is dead. In August 2010, the commercial development of SED was shut down.