I'm using Amsteel Blue for my support lines. Since the cord is so light, I decided to use it for my ridgeline. It's overkill and I decided to make use of this overkill.
First, my ridgeline is adjustable and removable. Second, the length of cord used for my ridgeline = the length of my support lines. This does two things (maybe more):
1. If anything should happen to a support line, I have a spare on hand.
2. If anything should happen to one of the tree huggers, the ridgeline may be used as a makeshift tree hugger.