I just finished Peter Leithart's A Son to Me, which is an exposition of 1st and 2nd Samuel (as one book). Very good, very informative, very enlightening. He catches all the things that I usually miss: the respective ages of David and Jonathan, the relationships between Ahithophel and Uriah, the motivations that drove Joab, the strengths of Saul, the decline of the Davidic kingdom tracing to the sin with Bathsheba, etc, etc, etc. He also finds chiasms galore. I would highly recommend this book, and, oddly enough, would recommend reading it the way I did: sandwiched between the Scriptures it refers to.