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Here’s a great website that reports on the quality of various dvd brands http://www.digitalfaq.com/media/dvdmedia.htm
You can also get user comments for some brands at http://www.videohelp.com
Just a caution: forged discs are big business, so make sure you buy your discs from a reputable source. If I remember, digitalfaq.com (the first link) gives advice on this.