A 720p plasma will get you great picture quality for everything can put on it for a great price.
After doing the research for myself it will be the plasma until they come up with something better. 58" Panasonic THX plasma in the house with fantastic picture and very black blacks. Check out the comparison of LCD/plasma TV's on the link below.
Here is a link for a comparison of lcd vs plasma from LCD TV Buying Guide. The 240hz LCD sets introduce their own set of issues with picture quality an excerpt from the article found here.
LCD TV vs Plasma TV Which is Best? from LCD TV Buying Guide
"LCD TV manufaacturers have worked hard to overcome the motion lag issue. Last years models saw the introduction of 120Hz refresh rate (up from 60). This year many models were introduced with 240Hz refresh rate. This refresh rate has drastically improved the response time. However, it also introduces unwanted video information by sharpening the picture background information and taking out necessary blur. This may seem like a positive, but with 90% of your viewing material, it is not. Depending upon the manufacturer, we advise turning off the 120Hz or 240Hz feature with all but live sports programming."