I wouldn't get a plasma as a PC monitor. Because of the way they work, full screen whites will be dinner than content with less white (some plasmas are dimmer than others). This isn't necessarily a big concern with video content because it's pretty rare to have any scene that's that bright. Web browsing, however, involves a LOT of white.
If it's going to be used for video content 90% of the time, sure, go for plasma. I would specifically look at the samsung f8500, as it's the brightest one available. If it's more like 50-50, LCD is probably a better choice.