I swear by the
TDK brand across the board: CD-Rs, DVD-Rs and BD-Rs. The BD-Rs are pricey, though, at least here in America. This is the packaging I get, there are several trustworthy Japanese dealers at this listing page:
http://www.amazon.com/dp/B003M6AGSA/?tag=imwan-20These are single layer BD-Rs with a 25 GB capacity. There are also 50 GB dual layer discs, but they tend to cost
more than twice as much and have a higher incidence of burn errors.