http://www.avsforum.com
Seriously, go there and read up. In each section (ie., LCD displays, Plasma displays, etc) there is also a thread on "hot deals".
Yes, you will get confused, but that is because there are so many choices available. And sorry Squee, but saying blankly that one format is better than the other is short sighted, and uninformed. I have a great plasma (Pioneer Elite) that I'd put up against any LCD. But I am not one to say that plasma's are better than lcd's. It all depends on the TV, the environment, and what you are going to watch. One thing to remember with both styles - unless you spend big bucks, your standard def broadcasts are NOT going to look as good as they do on your tube TV. The more expensive tv's will have much better processors/scalers that help with this. Also, remember that when watching standard def content, you screen size gets really small. So for example, a 42" widescreen when showing standard def, is about equivelent to a 27-32" tube TV in size.
You also want HDMI 1.3 connectivity for future expansion. For those that argue that 1.2 is adequate, sure it is right now, but most new audio codes cant be transferred unprocessed over 1.2. This is most important when setting up your home theater.
For 1500 you can get a Panasonic plasma, they tend to get good reviews. It should be 1080i, and maybe you can get a sale for a 1080p. Most reviews on the Vizio line are that they are adequate sets. But you get what you pay for in that price range - or maybe its more like you "dont get what you didn't pay for!!!"
As far as which level you want to get, if you are one to "invest in the future", then get a 1080p. Otherwise, 1080i is your best choice. Most cable and sattelite HD programming is in either 720p or 1080i. HD-DVD and BlueRay (PS3!!) are the only content right now with 1080p.