Eric Alterman makes some recommendations:
[B]ut for those who want a fuller picture of Reagan’s life and times, I’d recommend Lou Cannon’s fair-minded biography, President Reagan: The Role of a Lifetime, a book that can be admired by honest fans of Reagan as well as honest opponents. The most interesting meditation on Reagan’s character and presidency can be found, in my view, in Garry Wills’ Reagan’s America: Innocents at Home. An extremely useful perspective on Reagan’s role in the end of the Cold War can be found in Frances Fitzgerald’s Way out There in the Blue.