Honestly the T4 demo/necro tali with a lot Constitution is a great PvP weapon imo.
50 constitution for a weapon which also has some good DPS stats (70,8 Magic Damage, 40 Crit Rat and 91,7 CDR with perk) is not something that you can ignore.
I always prefer this tali in pvp to the T4 DPS tali.
T4 DPS dagger instead is just crazy OP of course.
T3 crafted staff is great indeed, and also the crazy tali from Sepulcher with 245 prot.
Anyway, the point is still the same: no PvP weapon comes even near to all these weapons.