Timothy Keller
When I read this book after being a preacher for 35 years, I thought to myself, “I wish I would have had this as a young preacher.”  Scholarly and insightful.

Biblical Preaching
Haddon Robinson
This is a good helpful overview of preaching, one of the standard books.

Between Two Worlds
John Stott
This is Stott’s major book on preaching and it is superb.