Looking to buy a new tv

Never really cared to educate myself on the topic until now
first off- whats the difference between LCD LED and PLASMA?

Second- which companies are dominating the market these days?

Also, where are all the deals going on? Good warranties? Ect

Im looking for 50-60 in all around decent tv, good for the buck,
mild gamer, like to enjoy a flick every so often, watch the sports games

any advise is appreciated