I have 2 Panasonic dvd recorders, the DMR-E55 and the DMR-E60. The E55 guide says it can use 4x disks, but there's no mention in the E60 guide. Thing is, I've always bought TDK DVD-R 2x disks, but now I can't seem to find them anywhere -- presumably because the trend is towards faster speeds. Is it still possible to find 2x anywhere, and if so, is it worth tracking them down? Knowing nothing about DVD tech, I'm basing my preference for slower speeds on the VHS paradigm. Remember how 2 hours was better than 4 hours which was better than 6 hours? Is it similar with DVD speeds, or is the difference between 4x and 2x quality less dramatic? Thank you.