Cold Necro/Dervish...need a bit of help...

I've been thinking of switching my Necro's secondary profession to Dervish when I get Nightfall, which will be sometime between 10/27 and Christmas. After playing a Dervish/Necro in the preview weekend I found that the two professions are quite compatible. I choose Necro as the primary because Mysticism isn't exactly wowing anyone. Well there is Avatar of Grenth and Extend Enchantments. Soul Reaping seems more efficient for the massive number of spells and enchantments you're likely to cast.

Skills I'm considering:
Chilblains
Spinal Shivers/Shivers of Dread
Deathly Chill
Icy Veins(Elite)
Grenth's Fingers
Grenth's Grasp(Elite)(when wielding a Cold weapon)
Trembler's Touch
Chilling Victory(for the Scythe wielder)

Of course you'll need a good Cold weapon. There's only one inherently Cold scythe so far, the one with the preorder. I'm open to suggestions about Cold staffs. I'm only a bit over halfway through Prophesies and have yet to run into any Greens or anything really that good. I've been running around the jungle in the vain hope of getting a weapon good enough to kill that annoying White Mantle fellow.

Anyways...is this a good idea? I've been wanting to trying something new for a while.

Note: This build has PvE in mind. I don't play PvP but would like to at some point.

You realize Grenth's Grasp is an Elite right?

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I use a Death Spiker build (yeah I know so weird).
Works pretty well consider it uses cold. Going to enhance it when Dervish becomes available, but Arcane Echo is so good =/