Who made the blank discs is more important than the brand, companies such as Verbatim simply outsource factories to make discs, then brand them with the Sony logo. You can identify where the media is made from its mediaID. When buying media, try to look for reputable sites (such as SVP.co.uk) which give you the mediaIDs of the discs; and if you're buying in a shop, Made in Japan is always better. Taiyo Yuden, Mitsubishi Chemical Corp., TDK, and Maxell are all considered to be the best media, though your drive might not like them.
This site has a good list of mediaIDs, their quality, and what brands you'll find them under.
It's best to experiment with various media to see how well they burn on your burner; each burner has it's own preferred media and differs drastically even if it is manufactured by the same company. Use DVDIdentifier to ID who manufactured the discs, and KProbe (for Lite-On DVD burners) or Nero CD-DVD Speed to do a surface scan of the disc.
Verbatim is good.
Jam it back in, in the dark.
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