Add to the tape stock confusion apparently there is an even newer tape stock Sony is recommending for use in their HDV pro camera (according to a tape vendor), and that is the SO-PHDVM63DM which costs anywhere from about $17 to $21 apiece. Wonder if that's worth the price. I'm just getting the camera, and unsure of which stock to try. I'm also going to be shooting some SD material with it, and like using the Sony DVM60EX stock (about $7.30). Wondering whether I would regret mixing this stock with one or the other of these more expensive stocks. Has anyone heard about this more expensive stock?