I recently returned a lower priced plasma beause the price was $500 lower shortly after I purchased at Costco. It went from $2k down to $1499. They suggested I bring the unit back and rebuy at the lower price. (Go figure)
Anyway I got my money back and decided to freshen up my research. Boy am I glad I did.
A few reviews rated the Pioneer 50" plasma as THE best out there. I shopped prices on the net and went to a local retailer who matched the price. For a few hundred $$ more I have what is worlds away from the first TV. I love it.
Here's one review....
http://reviews.cnet.com/Pioneer_PDP_5070HD/4505-6482_7-31951817.html?tag=lst
If you prefer another technology or size you can check out the rest of the site.