The Samsung UNB8500 series (LED LCD) is fantastic, if you ask me. I think it's pretty damn impressive. It blows every LCD I've seen out of the water. But it's four grand. And it doesn't blow the Panasonic V10s out of the water where PQ is concerned. The V10 is also $2,000 cheaper and has much better viewing angles than the LED.
The viewing angle issue... I never thought much about it. I owned a DLP, and I just sorta got used to the fact that you had to be sitting straight in front of it at eye level. Then it got struck by lightening and I scored the V10 as a replacement. With the V10's plasma viewing angles, parties are much more fun. When the boys come over to watch UFC, the picture doesn't fade away when for the fellas sitting to the side. Also, if you own a Wii a plasma is fantastic because you don't need to be concerned with the viewing angle issues when you're hopping around your living room.
If I had $4,000 to put into my home theater and I had to buy a TV... I'd buy a Panasonic V10 instead of the UNB8500, and put the other $2,000-2,500 into black-out curtains and some acoustic treatments for my room.
Also, as a once proud owner of one of the earliest Samsung DLPs, I encourage you to let other people beta test those LED televisions for Samsung. They shouldn't have put those DLPs out with those crappy color wheels. Lord knows what's lurking in these LED tvs that is going to have the first run owners pissed off in 2 years.