Zach went with 60' of HREW and has a 20' stick still here with his cage almost done. He had a-pillars from metaltech though. It looks like 60' will do a decent cage.
I am doing a full "family" cage with lots of bracing tied to the frame, I have 80' of DOM here.
"Do not go gentle into that good night,
rage, rage, against the dying of the light" - Dylan Thomas