I have a Panny RV-31 but I've noticed that it produces jagged edges on some of my movies, even though I've turned the sharpness down all the way. Someone told me that it may have to do with the downconversion of the Panasonic. With that being said, what players do the best job at downconverting? Is a progressive player superior, even on a non-progressive TV? or should I stick to interlaced dvd players?