I would also take a look at the Hitachi S500 line of rear projection TVs. The picture quality and customization options are fantastic. Plus, the price has really come down a lot.
I picked up the 65S500 back in April and absolutely love it. You can take a look at mine here http://www.smorty71.com/ht. They also make a 57" model.
I am looking at the new 57" rear projection Toshiba 57HX94 due out in September, any input would be appreciated? I have always been a Sony XBR fan but this new Toshiba is looking pretty good for the $$ and Toshiba has been doing well on the projection TV side in the last few years.