I mainly use Nokon and Saccon outers, but any coated outer cable will do just fine really.
What's most important, is to put enough grease on the inner cable itself. A thin coat along the entire length will suffice. Any excess grease will fail to enter the outer cable, so you'll get a ball of grease where the inner cable enters the outer one. That can easily be wiped off.
The grease makes the movement much, much slicker and adds increased rust protection as well.