I just bought my Pioneer DVR-A05 as an upgrade from my A03, so I'm looking for 4x media to go with it. The place where I normally buy my discs is offering the Ritek 4x. I have had nothing but good luck (zero coasters) using Ritek media, and it plays in every DVD player I have. Supposedly, the DVD-R media that are included in the DVR-A05 are Ritek. That right there says a lot if Pioneer uses Ritek media. However, this company is also offering 4x DVD-Rs from a manufacturer called Princo. The catch is that these discs are $30 less for a spindle of 50! I'm leery of going away from Ritek because of how well they've worked and that Pioneer include them with their drives, but $30 is a hell of a price slash. Has anyone used the Princo brand with their DVR-A05 with total success? I'm willing to pay the extra $30 if there's a chance of making coasters with Princo. I looked on the Internet for media compatibility tests with this brand but couldn't find anything. I'm also open to other brands that successfully use 4x speed with the DVR-A05 that don't cost an arm and a leg.