Would only look at branded steel cables (i.e. Shimano, SRAM, Jagwire etc), if buying as a complete package, Shimano set CABGR6 has inner and outers, and is available in a range of colors; if looking at individual cables, regular Shimano gear cables are avaliable in coated steel, and stainless versions, and their SP41 outer is good.

Jagwire, SRAM and others all make good cable as well, would look at what is available in you LBS.