I use JVC/Taiyo Yuden 8x Premium Line (professional grade) DVD-R media in all my Panasonic, Magnavox, Philips, PYE and Toshiba standalone recorders. These TY discs are sometimes priced as low as $25 for a spindle of 100, with free shipping at SuperMediaStore:
Verbatim still produces 8x DataLifePlus AZO (professional grade) discs but those are higher priced than TY, at SuperMediaStore:
I reserve 16x DVD-R media for duplication or computer use.
For quality duplication I use 16x Taiyo Yuden or 16x Verbatim AZO series DVD-R media. For ordinary duplication I use 16x Maxell or 16x Sony media.
For immediate duplication and distribution of short-interest material (say, two weeks to six months) I use 16x Magnavox, 16x TDK, 16x Verbatim Life Series media--all landfill grade CMC media. (Other inferior CMC media is sold under the Memorex, Imation, Philips and HP brand names, among several others.) These CMC brands are often found in retail stores at $12.99 for a spindle of 100 discs. CMC brands are not suitable for archival recording or critical data storage.