No, they can't handle various resolutions well. Even the best line doubling looks chunky. Even the most inteligent compression looses information. And the best LCD's still can't handle full screen fast motion and high contrast very well. LCD's work on a fixed resolution, relying on software to handle different scan rates and to map different resolutions to their 'native' resolutions.
Plasma screens are cool, but very expensive and very short-lived.
They also have higher contrast ratios. In the monitor realm, LCD's cost about twice as much as a monitor, and will probably last the same length. Although this is just an estimate since they are very new in this field. In the realm of projectors, the general guideline I advise is based on your computer life cycle. It was dead on conception.