Thanks a lot for your answers so far. I didnt know about SVP of Apr Media but as usual Google helped me out.
Partly I burn things which don't have to last for ever, like certain software or a TV-program. Would it be a good idea to use in that case for instance Datasafe, Philips DVD+R Printable or another less expensive brand?
For things like films, documentairies, music, personal memories etc., when it comes to longevity, it might be nice to use Fuji or Taiyo Yuden. Is it sensitive to make such a difference, is any choice a personal and subjective one? What do you think?