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I don't know enough about skis to make the decision. I did searchbar this by the way, none of them answered the questions I have. I'm 5'10'' I think, or pretty close to that, and 115-120 pounds. The alpha 1 is brand new, in the plastic, for 330. The alpha 2 is not brand new, mounted (buying without bindings) for 425. Alpha 1 = 182cm and alpha 2 = 176-178 or something.
SPARKNOTES: Im 5'10, both are 2010 skis, Alpha 1 = $330 alpha 2 = $425, alpha 1 = 182cm alpha 2 = 178cm. I like jumps more then rails, but am planning on doing rails again this year.