CD-R media, I bought millions of different brands over the year, never burned above 16x and never had an issue (Other than Memorex) but that was years ago !
As for DVD Media, everyone will agree to say: Taiyo Yuden.
Verbatim, and Maxell [Made in Japan] are pretty good !
if you will look in here weekly, a few of our members will post up the sales for the week beginning... like this one (it was last weeks sales and where) and it is posted here weekly, BTW !
http://forums.afterdawn.com/thread_view.cfm/267201
that should get you in the right direction. better then asking this same question, as alot of new members do, who do not quite know this site, the rules, or how to use the search button..