Jeffcohowrote a review of Gore RideOn Sealed Low Friction Derailleur Cable Kit on March 19, 2011
They keep clean easy and don't rust up if you get them wet and don't wash your bike right away.
It was easier than I thought to install. Buy or borrow a cable tool.
Oh, I did have to open up my trigger to make room for the sheath. That was kind of sketch but works.