Have any of you actually kept these fish regularly? I have; they're native to my region. Adult dollars will often eat rainbow darters.
Sometimes they ignore them, but if even one goes after one the others will start eating them too.
You may not have any issues if you raise the dollars with them from juvies, since sunfish can become too lazy or unaccustomed to hunt, but I personally wouldn't take any chances with them together if I paid for them.
I hope it works out for you and not trying to be negative. I'm just being honest with my experience.