With those kinds of costs, and some challenges with availability, I was thinking about a "group concept" army, similar to the Elf Wizards. The concept would focus around the newly released "Fire Diabolist" who looks awesome in pictures but not sure how she'll look in person. I am thinking of this group as Cultists who worship/follow the Fire Diabolist (who might be a demon).
Fire Diabolist = Demon = Leader
Thrune Agent = Human = Cleric
Priest of Asmodeos = Human = Cleric
Thrune Enforcer = Human = Cultist
Lamashtu Thug 1 = Human = Cultist
Lamashtu Thug 2 = Human = Cultist
I was considering using the Elf Wizard ... "bonus for each Cultist or Cleric that follows Valkrill within 3 clear sight spaces" concept. Still need to develop some powers, but this group could also have some synergy with the Nhah Scirh cultists unless we're careful with wording.
Anyway! no powers yet .. but throwing this out there.
Sorry for the different image sizes. Had trouble finding uniform images.