Yes the Bentusi give the Super Acolyte fighter, on the last mission of HW Cataclysm.
On HW1 & Cataclyms the bentusi only have very few ships, the Huge ships, (bentusi trade stations i think their name are), the super acolyte fighter, and other ship wich i don't know it's name, some kind of cargo ship i think.
I don't know if the bentusi appear on HW2, since it doesn't run on my computer
