My TV is a Panasonic TH-42PX50U HD Plasma. I'm on Comcast digital and use a cable card (no cable box). I'm concerned about potential burn-in. Here's my question: I prefer to watch the HD version of stations which broadcast in both HD and analog (example: CBS), obviously because the picture is better in digital HD. But most programming (especially away from primetime hours) is not in HD, which places gray bars on the sides of the screen. And unless I'm unaware, this Panasonic will not allow you to change the aspect ratio when you're watching an HD station. You must leave it on 16:9. From what I've read, it's better to stretch the screen and eliminate the bars so as to reduce the liklihood of burn-in. So, what to do?? Watch a worse anlog picture and stretch the screen, or watch the better HD picture with the bars? Or (the best solution), is there a way to change the ratio on an HD station? I understand that this issue is not relevant with primetime programming, but what to do the rest of the time?