Their recommendations are here. Now I feel obliged to offer mine, and encourage other NLT contributors to offer suggestions as well.
First, Ill relieve Steve Hayward of having to be shameless, recommending Greatness.
Then, Ill relieve Peter Lawler of the same need, recommending Stuck with Virtue.
I think that Jim Ceasers Nature and History in American Poltiical Development solidifies his standing as one of our smartest and most thoughtful commentators on the deeper cultural and philosophical roots of the American regime.
Finally, if youre still at a loss, consult this list, from which any purchase benefits the Ashbrook Center.