Oh I like Dunn Bros too! I have to go there now to use their computer because my monitor at home went out!
My absolute favorite restaurant in Rapid City is
Delmonico. It's very pricey but well worth it. Get the petite filet with asparagus and the butternut squash soup! Ooooh bliss!!!
I also like:
The Enigma
Botticelli
Minerva's
Qdoba
Just to name a few of my usuals...