I bought that exact TV a few months back Shelly, and I'm very happy with it.
The screen burn ins is pretty much a thing of the past with the newer plasmas, and lifespan is very similar to LCD now as well. Haven't heard of the buzzing issue, but mine has no such problem.
Since my room is dark, plasma was the right choice for me. The background is Blacker than any LCD or LED that I looked at.