I'm looking at 58" plasmas and want to buy locally, so I can return it fairly easily if I get the dreaded buzzing. My local Sams Club has the Samsung 58B540 for $1697 and Sears has the 58B650 for $2139. For $430 difference, is there that much difference between the two? I'm not worried about any internet features and I never use the TV speakers, just my surround system. I'm only concerned with the picture quality. I've got what I would say is a medium bright room where I can easily put the blinds down. Thanks for any insight!