Panasonic has proven itself to be the hardest-punching heavyweight among plasma-TV makers, and this year it fights its title bout against itself. In the other corner there's the consumer lineup, represented in 2005 by the TH-PX50U series and the model under review here, the TH-42PX50U ($3,000 MSRP). In a nutshell, the industrial models are all picture, and the consumer models make you pay a few hundred extra bucks for features such as, say, speakers, a tuner, and all the inputs you need. The TH-42PX50U is a solid performer in just about every performance aspect