only crystal bow imo, others are just for :completing" your pure
They're all useful in their own ways, anchor is good with gmaul, like the Cmaul to gmaul combo.
Crystal bow is decent, however it's not really required to make your account beastly, as it's not used much, and there's the zaryte bow.
Zanik's crossbow can hit in the 50s I believe, so why not? The quest is pretty easy, too.
I think zaniks would be the best..but a d bow spec can 1hit(spec) sand I'm not sure if zaniks can, although I have seen lots of big hits from it by pures

