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I recently got a great deal on some Sisters models, and I'm looking forward to putting them on the table. That said, the official minis are quite expensive and don't necessarily have the best options for what I want to field. So with that in mind, I was hoping you could recommend some alternative miniatures for the units listed below. I'd rather aim for something cheap (like the Reaper Bones minis or Pathfinder minis) rather than go with something pricey like the Toughest Girls in the Galaxy stuff (even though their models do look great).

Units I still need to add for my intended list include:

Priests (something less angry-mutant-potato-looking than the official models if possible)
Canonnes (I like the official model, but something unique would be good too.
Celestine (again, the original is cool, but I'm looking for possible alternatives)
Celestians with power lances.

Some possible alternatives for inquisitors and assassins would be nice too. Thanks in advance for your help, everyone.

One option some people are going with are the Dreamforge Games Eisenkern models (both the stormtroopers and the Valkyr) using female heads from Statuesque Miniatures. Below is a pic of a Valkyr with the female heads from SM. That could be a good starting point for some of what you want to make.

You could literally use your Tactical Marines and nobody would care. Tactical Marines are that bad that people will let you use those models for that purpose.