Far from an expert these days but Ive done my share of business in the home electronics space when I had my home tech company.
Plasma much like Beta video cassettes is the superior quality that is losing market share because of ignorance. That said Plasma isnt likely in the future, but it IS the better tech. Plasma has true blacks, LCD/LED's try to simulate black by mixing brown and blue. Plus when it comes to sports viewing Plasma had 600Hz refresh rates 10 years ago while backlit (led/lcd) is still trying to dream of being there and bragging about rare 480Hz models.
All that said. If you want a plasma (and I have 4 of them in my house) Panasonic and Pioneer are the only two to consider.
LED/LCD are 2 ways to crack the same nut with LED being the newer and "superior" technology.
SONY (which by your own admission your are a fan boy of) is really not the best option in either market, when you say that you are not sure if you plan on having surround sound stay away from SONY there sound quality on their monitors sucks at best.
Many will scream "BUY a VIZIO they are made in 'Merica"....well the chinese parts get put in a box in America, and the price is low because their QC standards are non existent while they specified component production is damn near industry leaders..meaning no idea what you will get from DOA to average to AMAZING....Caveat Emptor here. No other manufacturer has the quality variance these guys have.
The screwy thing is manufacturers have literally started hitting price and making models for individual retailers. SO Target may have a different TV from Wal Mart from Sears from HH Greg from Best Buy etc. A great resource to weed through the BS is
http://www.avforums.com/ (Note these guys are the PBB of the AV world, so if you read the wrong thread and someone comes in there all "I'm going to win KOH in my new stock Rubicon"...you will see a lot of "shove you POS Rubi up your ass it cant crawl shat" response. Which isnt to say that a Rubi isnt badass in stock configuration COMPARED to other stock conifgs.. so understand what you are reading.
FWIW I am much better (and more than willing) to analyze specific models at specific prices...