Definitely get a hangar. A very high frequency of hail around the Hills. Rapid City KRAP is closest of course but towered.
My choice for the area is the mountain airport experience at Custer County KCUT. Custerhttp://westernhillsaviation.com/C ... rport.html
. This is a great little airport with great people.
From Ellsworth it is under an hour. Check out comments on Air Nav. If not wanting the extra altitude try Spearfish KSPF not much further. Can't go wrong with either. Private airfield with hangar space is tough to find but worth a shot.
Forgot to mention Sturgis. Never been in there but close also.