Yup, I disagree....008 = legal, sufficiently strong, but a Real Bother to mess with...it kinks if you look at it crosswise. Handle it almost literally with kid gloves, don't ever let it drag across the ground (paved or grass either one), when untwisting after a flight you must be VERY CAREFUL to avoid introducing a kink...it's good for competition because it's so light and low drag, but for sport flying, or even much practice flying, I wouldn't use it (and don't).
I use Spiderwire almost exclusively, up to 48' and .061-powered combat wings. But if you're uneasy about that, I have a set of .012 multistrand and it works OK even with the mild-mannered Cox Surestarts, etc. Yes, a little draggy; just set your LO guides a little further back.
I never saw Dacron that wasn't stretchy. Not to say it doesn't exist, Larry says it does so it does, but this is the first I've heard of it.