The best place to find out about DVD media is NoMoreCoasters.com
It isn't necessarily the brand that designates the quality, but the manufacturer of the discs. Most media brands don't actually make their own discs, and some actually use multiple manufacturers.
From NoMoreCoasters.com:
It is the media ID that is important, as it reveals the disc manufacturer. Unfortunately, this is not written on packaging or anywhere else. Companies want consumers to be oblivious to this sort of behind-the-scenes information. To learn the media ID code, a blank disc must be put into a computer DVD burner drive and the ID read by a special utility. Some burning software reads the code by default (DVD Decrypter, for example, in ISO write mode). There are also a handful of freeware or trialware tools available: DVD Identifier (free), DVDInfo (free), DVDInfoPro (trial)
For Macintosh OS X: DVD Media Inspector (free)
Now that you're paranoid about what brands you buy, the brands you should be able to trust are Taiyo Yuden, Sony, Verbatim, TDK, and to a lesser extent Ritek/RiData. I've used Verbatim, Taiyo Yuden, and Ritek discs with my BenQ DW1640 drive and have probably only had about 3 coasters over the last two years.