mohair are light and sick for longer tours on super light skis, look into coll tex if you're thinking of mohair but be prepared to replace the tip loops because coll tex loops suck balls
i've always had good experiences with bd nylon skins, can't really go wrong there
as for g3, i got a bunch of pairs during the sale a few years ago but i'm really not satisfied. they have a serious glooping problem when it gets warm and they have trouble staying on your skis because they stretch too much and loosen. not to mention they're also somewhat heavy. i've been using them because i have a stockpile but i'd go back to black diamond if given the choice
i have coll tex on my super light touring skis and i couldn't be happier, but i wouldn't use them on my billy goats, i'd get a cheap 130mm skin and cut it down just for shorter tours