There are several different manufacturers who produce lightscribe compatible disks. The best are probably made by Verbatim. I would recommend even the regular 16x Verbatim dvds over Memorex.
Lightscribe labels are rather slow to make, and not as impressive to me as those made with ink jet printers. Both lightscribe and ink jet printable disks are more expensive than regular ones. Of course you have the extra expense of the printer and ink going with ink jet labels.
I make do with an ultra fine Sharpie.