So I have been looking at this site : www.wowbestinslot.com
According to them, the Ti'Tahk staff that grants you a haste proc isn't BIS for Shadow priests.
Your thoughts about this, I am currently using the DW dagger that poisons the target, how big of a dps increase/loss will it be to replace the dagger with the staff, and what are you opinions, which weapon is BIS for spriests.
(I don't have Teracgosa and I am not on the quest so that's out of the discussion)