I spent a lot of time reading at this forum:
http://www.avsforum.com/avs-vb/forumdisplay.php?s=&daysprune=30&f=9
I ended up w/ a Hitachi 50v500 (3 years old now), and have been very happy with it. Technology has changed a bit since then. I like the LCD or LCOS rear projection tvs - the DLP has that 'rainbow' effect for me. I get sick watching it.
Sears will price match anything you find (internet/cc/bb) and then take more off (I think it is 10% of the price difference). Plus they have sales where everything is an extra 10% off, which can bring down the prices quite a bit.
Just be sure the price you show them has delivery charges/taxes included.
Happy hunting. I'll be looking after Christmas - New Years, when the prices start to go down - the big sales b/4 the Super Bowl and the annual CNET meeting where they show the new models (IIRC).