STJ/Dark Brute/Scrapper or TW/Dark Brute/Scrapper
Street Justice. TW is such an end hog that you'll be vying with DA for endurance management.
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Totally agree with Agge. Also, I like the look and feel of Street Justice a lot more, too.
Of course, you could wait and go Staff/Dark....
No clue how well that combo would work, but thought I'd mention it.
Whats the advantage of waiting to go staff/dark????
I would suggest TW/Dark. I haven't bought TW yet, but I've seen some nasty TW/Dark brutes that manage agro well and dish out some serious damage. Having the +Chance for Endurance proc in your accurate healing dark heal is very helpful.
Eh staff is nifty....

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I have an idea for a Brute or Scrapper with a "Darkness" theme. What would you recommend as a primary- Street Justice or Titan Weapons to go along with Dark Armor as a secondary??? Open to all suggestions.