Three tree rogue build

[Concillian]

Aah's Sinister Rogue Sister Ooh is looking to be a complimentary partner to Aah, in the build.  Currently I'm leaning heavily towards the traditional PvP dagger build, as WSG will be a place these rogues frequent.  We'll be the "Invincible Defenders"!!  :P  However, I too have virtually no rogue experience, and I mainly want to build one that is very effective in WSG, good in party play, and yet still able to solo.  :P  How's that for a tall order?  Isn't that what most chars want to be able to do?  Basically, I too am open to suggestions. I just didn't think going the same spec build as Aah would be the best thing, I want to be a good complimentary build to fit with Aah.
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I think Cold Blood is pretty much a necessary PvP skill. Especially with 2 rogues. The burst damage of it is too useful to pass up, and the cooldown is not terribly long (3 minutes).

I think improved ambush is also very good for a pair of rogues. 2 rogues ambushing a caster at the same time will take off a huge chunk of life, both doing a CB/ambush = instant death to the caster.

These builds are highly opener dependent, but powerful when they are able to land an opener. Another way to complement would be to go primarily combat so you have Vor being stun / opener and you being better at sustained damage through blade flurry to take advantage of the hemo bonus and Dual weild spec for better sustained damage output.

Vor, you might consider murder. Murder makes an opener NEVER miss (including sap). Missing your opener really, really hurts in a build like yours. Soloing you are going to start using imp. CS a lot, and man it really hurts to miss a CS when you're used to getting 2 or 3 combo points straight off the bat. I'd take points from Imp. SnD for that, since SnD can be refreshed pretty easily (and it's getting easier in 1.9, as you can SnD after someone is dead or out of range)