Line or mic level analog balanced, I presume?
Star Quad is good stuff, but could be a little tricky to work with, since it's double conductors.
Canare, Mogami, Belden all seem fine to me, some are thicker, some are more flexible, what are ya looking for?
When Tourtelot made me a custom cable, he suggested Belden, since it was for an unbalanced line level application.