[Taqwus]

Your regular "poison dagger and leather armor" assassin isn't too good... but they're cheap, and have all the usual equipment slots if you must.
Abysian Slayers are a touch nastier, IIRC; C'tis Empoisoners are mage-assassins; R'lyeh Star Children can mind bLast and have Astral-1; Machakan Bane Spiders are very well-equipped and trained.