Plextor has a recommended list of media for a reason. If you want your discs to last and your data to be readable a few months down the line, get good media. If you buy a spindle of CD-R media for $20 with a $15 dollar rebate, figure it out for youself..with the manufacturer, wholesaler, and retailer making a profit on the deal, the media has to be manufactured cheaply..
Compare prices...if Verbatim is $2.00 each, and another vendor is half that, sombody is putting less into their product. You do get what you pay for. If you back up to cheap RW, and find out in a few months that you can read only half the discs, don't blame the writer.