Couple of thoughts.
First, love Stephen Hunter, have read them all.
In addition to the other thriller writers mentioned, Jack Carr, a fairly new author, writes the James Reece series. The first book, The Terminal List, will be a mini-series on Amazon July 1 starring Chris Pratt. If you want a Winkler tomahawk, better get one now, there will be a run after July mini-series.
And, while he did spend 20 years as a SEAL, this isn't another "my time at BUD/S" book. Well crafted with lots of twists.
Didn't care for Koontz' Odd Thomas, but the Jane Hawk series is haunting and pretty prescient of current events.
And his "dog books", Watchers, and Devoted are excellent.
The early Randy Wayne White Doc Ford books are excellent; former spook working as a marine biologist on Sanibel Key. Quality goes way down after about book 10.
The Jesse McDermitt series from Wayne Stinnett is pretty good too, although kind of a knock-off of the Doc Ford character.
Read all of Larry McMurtry's stuff. Warning that he was very depressed at times in his life, and it shows in his books, so if you tend towards the down side maybe not the best reads.
For crime I like Michael Connelly, both the Harry Bosch and Micky Haller (The Lincoln Lawyer) books.
For classics everyone should read Green Hills of Africa.