Iomega's 52x 700mb recordable CDs are quite reliable. I've bought a 50 piece spindle of it and so far, I haven't got any failed burns on my CD writer. I've been using the maximum speed possible on my writer which is 48x, though Iomega is rated at 52x. It's a good bargain since it's not too expensive, and yet it's quite a reliable CD-R.
So far, I have no problems with the data burned on the discs. Sometimes, I leave the disc lying around with no cover, and when I get back to it it's got scratches and all on the underside, but most of the time even with that much damage I can still manage to salvage pretty much of the data.
I recommend Iomega 52x, it's low priced, and good quality. Buy this, it's worth the price!