I might take a look at those SVP ones, too.
A recent email I got from SVP was entitled "Where have my favourite discs gone?" which explained why they had deleted some types of discs.
The email listed "recommended alternatives" for the ones they deleted. However, all of the alternatives were for "minus" discs. They even recommended "minus" discs as alternatives for "plus" media. I took it from this email that SVP were abandoning "plus" media altogether. I mostly use Verbatim DVD+R and the idea that SVP's recommended alternative was Verbatim DVD-R seemed somewhat bizarre to me.
Given this and considering that both my burners are plus-only and my DVD recorder is a Philips, I felt there was little point going to SVP any more. Perhaps I was wrong, but this isn't the only time their emails have implied a minus-bias.