Hi Sue,
We just went through the same thing. What we found is that the plasma TVs are 10 times better than the projection units and 5 times better than LCD screens.
To see one of the differences, step to the side of the TV when you're checking it out in the store. With a plasma TV, you can view the screen from just about any angle. We didn't find that was the case with the LCD.
We went with a Panasonic and we love it. It's also the first time we've been able to view High Definition channels so that's also made a huge difference.
When we were shopping, J&R had great prices (even though I'm not crazy about their customer service).
Andrea