What are you looking for Sprior - Panasonic, Samsung?
The LGs have some good reviews, Mrs P is enamoured of the 60in model.
If I may, we just researched and bought a 55in Samsung. Did a lot of in-store comparison shopping, then bought through Amazon for a variety of reasons.
My perception was there is a huge viewing impression difference between 46in and 55in, but little between 55 and 60. Price is not linear either.
LG has good ratings. Samsung too. We went LCD after looking at the cost difference on pure LED models. We never really considered plasma.
Big factor for us was number and type of inputs. We had a home theater sound system from olden times we spliced in; the installed TV speakers are fine for everyday, but lack oomph for action movies. If you do a lot of movie watching you'll probably need to budget for at least a soundbar. We also spent for a decent cabinet to support it. Didn't want just a rack. The big TVs are heavy, but you also need to make sure there's clearance on width. Many cabinets from just two years ago are maxed on a 46in, and bigger widths allow you to hit them when passing by.
A big field of competitive action these days is the on-line built-ins, especially the Web widgets preprogrammed in. If you intend to stream the Internet to it, Netflix, Hulu, or similar, the widgets aren't as important. Some upper-class TVs have built-in wireless recievers, but most don't. Our Samsung wants an accessory reciever which plugs into a premade port. I think it's about $80 USD. We haven't worried about wireless streaming yet.
Also, I have a 6-YO analog Tivo which won't do the TV justice. Can't even see the digital channel tier on the cable system. We'll be popping for an HD Tivo this summer.
Good luck with the purchase. It's expensive, but we've already determined we will never go to the movies again. In our TV room nobody texts in the dark, and the popcorn costs $.15.
A year ago I bought two 54" Panasonic Plasmas. Great HD picture but they suck electric through a fire hose. And they run so hot that here in So. Cal I don't even need to turn on a heater in the winter, but it the summer they are killers.