My favourites:
-Jim Chee and Joe Leaphorn by Tony Hillerman
-Stoney Calhoun by William Tapply (only 3 books: the author passed away recently)
-Walt Longmire by Craig Johnson
-Pike and Cole by Robert Crais (new book on Pike next January

)
-Picket by C.J Box
I like when the plot and characters are in the wild wild west