You should be great with any of those breeders you are considering.
I always thought kammers pricing was a little high, but I've ordered maybe half dozen chams from them over the years and they were always very healthy and thriving. Trouble free pet.
That is true of the others you are considering too though.
If I were you I'd probably choose according to how much I liked the looks of the parents because I really don't think you can go wrong with any of the folks you are considering...