Thanks for the replies, I really do appreciate it. When it comes to TVs, I am "a sucker", I just don't know much and can't keep up with the technology. Half the time, I don't even fully understand it. I do appreciate the differences in picture quality when I'm in a store looking at them, though.
I would only buy used if it was a smoking deal on something with a lot of life left in it, and something of very high quality for a fraction of its new price. That would appeal to my budget right now, especially since I need to sink $$ into sprucing up my place in other ways.
I watch mostly films and TV series on Blue Ray or regular DVD but would like a good picture for sports and the evening news as well. Film quality is top priority, though, and plasma has been the best I've seen in the past.