Just watch out where you get Riteks. Riteks are the cheapest decent media, but they have graded media. That is, they have A, B and C grades of their discs, and if you're getting a dirt cheap deal from some place like Meritline or Supermediastore, you can guarantee that it's the lowest grade media, not the retail-grade stuff that people use when they review drives.
I'm pretty sure from what I've seen that the Riteks that come in a plastic spindle case are always A-grade. What I'm not sure about is the stacks in the red shrink-wrap. There are also Riteks that come in plastic shrink wrap and do not say Ritek on them. These are the really crappy ones (it should be obvious since Ritek doesn't want to put their name on them). They still are identified by the same manufacturing code as the A grade in DVD Info, but they're bad. I've seen obvious defect spots in the dye on C-grade ones.
If you have semi-important data to backup, I would seriously suggest you only get Taiyo Yuden 8X media. Maybe this is obvious, but no matter what the brand, 8X seems to be better made than the 4X version.