I have read the first two books in the Lion of War series by Cliff Graham. Both were excellent books about David and his Mighty Men. I have also read the short stories called David and Benaiah. All of the stories use the biblical account of David and his Mighty Men as a springboard into these fictional stories.
The cool thing is that now Day of War is being made into a movie. The setting is Hawaii and production is under way. You can see some pictures from the work that is being done and can even get on board in helping to fund the film. Check out the video: