LG and Samsung combined make over 90% of the LCD and Plasma screens in the world. The new screens go in their flag ship lines. The ones that are over a year old get sold as Best Buy house brand, Vizio etc.
I have had a 55" LG Plasma for three years now. I use it a lot and no problems. One thing I did notice, Plasmas kick out a lot of heat. I am pretty sure it is a fluke.
If I had to do it again I would get an LED. Plasmas work great in dark rooms. I had to pretty much black out all the windows in my living room. My Plasma looks like a mirror with the lights on while it is off.
Grubunner if you want a Panasonic Plasma you better hurry: