maybe post up what you will be using them for mostly.. movies only, gaming etc..
The LG 8500 seems to be one of the few big dogs of LCD this year, with a slight banding issue and reflective screen.
I was told that gaming on the 8500 is not that great though it does rival plasma for depth and blacks etc..
The Samsung C8000 plasma is probably one of the best movie tv's i've ever seen to be honest. I saw a bluray demo playing on one while comparing lcd's and was absolutely blown away by how natural and clean the picture was.. I have never owned a plasma myself though so definitely check out the issues known for the specific models you look at.