400# monofilament is a solid hunk of plastic and does not drape well. Actually, I don't even like 100# mono when I need it to lay flat. It's just not limp enough.

To the original question, I prefer 100# braided spiderwire (or 80# sufix braid, which I just started playing with), you just need to be careful of the mantle. If that frays, spderwire's kernel threads quickly degrade in UV (sufix may have better UV resistance, I'm still testing). These exotic materials are more expensive than dacron, but the cost isn't that significant in the amounts I usually try to have around.

As for emergency climbing, I keep 300ft of 550 paracord in each vehicle and 100ft in the BOB. I have climbed on it (doubled, short fall only), and the stretch was really important on my test falls. I wouldn't climb on a static line unless that's all there was between my ass and oblivion. I'd probably try to move the attachment point away from my waist. Too easy to break your back with a static line that way.