I'm going to use that yellow rope
from Wal-Mart - I hear it's easy to splice.....
In what ways would Dux be better than Amsteel Blue for this application? It's a little smaller diameter, so that's nice. It's arguably (given the diameter) more abrasion-resistant, but this will be a hopefully-seldom-used stay which can literally be replaced in a half hour. There's the creep thing, but this thing will spend most of it's life not under tension, and attached by an easily-adjustable device. I'll probably order the Dux, instead of going to any of the dozen or so local places that stock Amsteel, because that seems to be what the cool kids
have, but I really don't see any reason why a lot of other materials wouldn't work just fine in this application.
Now can you post some pictures of your terminations, please?