out of those choices, I'd go with the invaders. But I haven't rode them. I've heard good things but I won't talk them up too much.
I ski pennsylvania mostly, and i ride scratch FS's. They are softer, and i ski all over and they hold up on the icey stuff pretty well. The FS's might not be a bad choice either.
king skiing preppy again since 1999.
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Just sign up for a credit card and if you don't wanna deal with it, destroy it when you get it. You won't have to spend a penny.