I answered a question a few days ago about some good books concerning the United States after WWII. A lot of the recommendations from there will apply equally here.

Since it seems you're primarily interested in U.S. foreign relations, you may also want to take a look at this hodge-podge of books that aren't in the other post:

Mark Bowden, Guests of the Ayatollah: Focuses on the Iranian Hostage Crisis

David Farber, Taken Hostage: Focuses on the Iranian Hostage Crisis within the broader context of the U.S. domestic environment of the 1970s.

The best book on Reagan's military interventions is James Scott's Deciding to Intervene, although it's somewhat academic in writing style.

Still the best book on the Reagan administration is Lou Cannon's President Reagan: The Role of a Lifetime. While the book is an overview of the entire Reagan administration, the authors spends a lot of time on foreign affairs.

Simon Reeve, The New Jackals. A great book about the U.S. encounter with Islamic terrorism before 9/11. Focuses on the 1993 WTC bombing and the spate of international terrorist attacks against the U.S. throughout the 1990s.

Mark Bowden, Black Hawk Down: The book the movie was based off of about U.S. intervention in Somalia.

Lloyd Gardner, The Long Road to Baghdad: A History of U.S. Foreign Policy from the 1970s to the Present. Gardner is one of the most renowned contemporary historians of U.S. foreign relations. He provides the historical context of U.S. foreign policy that eventually led to the 2003 invasion of Iraq.

James Mann, Rise of the Vulcans. A very readable intellectual history of the rise of neoconservatism with special attention given to the early careers of George W. Bush's foreign policy administration.

Lawrence Wright, The Looming Tower: Great book about 9/11 and why it happened. Spends much of its narrative in the 1970s and later.