We don't have ProdiscS04 (if you know a branded media that uses it, let me know)
Bulkpaq Orange (Generation 4) 8x DVD-R (25 pack spindle)
Nice and cheap (£5.99/25pack when I've bought them), and they write well on Plextor 712a (in fact a bit better than Datawrite's 8x FujiFilm03) ... the only problem is that lately I've seen Bulkpaq's using Infosmart and Princo dyes as well ... including a fake TYG02 dye (www.feurio.de) ... and some vendors do not indicate which one they sell ...
It looks to me that they launch the discs with a good dye, and when they become popular, they start using crappy dyes like Infosmart, Princo or even fake TY ... Bastards!!!
It seems that some of the 8x Printable Bulkpaq's also use this ProdiscS04 dye.