Cone material is only one part of the driver. Look at the Seas Excel driver with its magnesium material, seems to be something in between a paper and poly. But also hold the driver in your hands and ck out the craftmanship of the driver, the copper phase plug/magnet, the entire construction is something to behold. dang near work of art. Sounds good too!
I've never liked poly (plastic!!) cones. I had a great paper cone speaker until I came across the Excel. Next best cone material I ever heard is the french line called Cabasse, its a white 'form" material, not sure if they make it anymore. I heard their midprice line and thought it was OK, it was poly I believe. Also mention goes to B&W for their Kevlar, not bad, but I don't like the midrange that comes out the driver, too boxy/warm/muddy/attacking/fatiguing.