I've explored the Rapid City area for relocation. Have a realtor on tap should I decide.
SD property tax is a consideration - the counties are tied to the tourist or gaming economy. When they flourish, the taxes are low and visa-versa.
Sundance, WY is 79 miles by Interstate and Beluah, WY is 57. Ellsworth AFB is growing and has a Class 4 Commissary crammed into a Class 3 space (Class 1 is the largest).
The WY border has small towns with more tax and political advantages that SD does not always have.
These towns have Black hills forests, plains, and hills and property is quite available and affordable.
55 miles in the other direction is Gillette, WY which is a former energy boom town (FJB) that has most of the offerings that Rapid City has. I have a realtor there too.
But the wind. Yes it is windy as heck there (and in Rapid City) because Wash DC SUCKS!