I've looked at upgrading my 42 Panasonic Plasma for a good few years now but never been impressed enough with anything to make a purchase
I see OLED sets are reaching affordable prices now, is there anything bad about them apart from the price?
Why the wish to upgrade? Is it to go bigger, or better? What model is your existing Panasonic? If you go OLED, as Ronan says, read the Panasonic OLED thread and the LG EF950V owners' threads - getting a good panel is a lottery.