I usually pull about 3.5k DPS in raids, here's my armory page "http://www.wowarmory.com/character-s...ist&n=Ruinner"
My rotation is:
Stealth
Garrote
HfB
(1/5)SnD
(5/5)Rupture
(3/5)Envenom
And then I switch between (5/5)ruptures & (4-5/5)envenoms keeping HfB up of course.