Try Sam’s Club or Costco for selection and reasonable prices.
Try Consumer Reports for reviews.
Do some web searches and read where people gave reviews.
A lot depends on what you want. You have to ask many questions like Where will you put it? On the wall, on a stand etc. How big is your room?
DLP or LCD screens will not suffer burn in. I think Plasmas are better than they used to be for burn in and possibly have eliminated it.
A good place for reviews is CNET.com. I think Audioreview.com or stereoreview.com is another place to look.
I have a 55" Mitsubishi rear projection widescreen (Top of the line Diamond Model) that I purchased on Labor Day, 2000. I have had no problems at all with it. Rear projection can suffer burn in from screen logos and other static images.
Costco does sell some very cheap sets, but I don't know how long they will last. Another coworker bought a cheap DLP set made in China. It has been repaired twice so far. The light lasted less than a year.