I have a Toshiba Plasma. Its about 3 years old. I bought the Toshiba because it used the higher end Panasonic plasma display but came with a tuner. At the time, to get the display, you had to buy a monitor only. What this taught me is that there are only two or three display manufacturers, so it can pay to shop around to know what you are buying. Some units have the same display but can vary in price based on marketing and branding.
At the time I purchase, LCD's had a problem with pixelating on motion as in football games, so this made me choose plasma. However, I am moving to Colorado, so I will switch to a 120 LCD because plasma's emit an annoying hum similar to a flourescent light at high altitude.
Costco is a good place to shop, they have many screen on display so you can compare them side by side, and they have or at least had a really good return policy on tvs's.
I bought mine from DTV City (www.dtvcity.com) ( I have no affiliation with this company). They were the most competitive on price for an AUTHORIZED dealer. Many online deals were less, but they were grey market and would not have an OEM warranty.
Good luck and have fun shopping
CParker