Second that nomination.
There has been a wave of new books about the Founders in recent years, of which Joseph Ellis' Founding Brothers and McCullough's John Adams are standouts. Isaacson's bio of Benjamin Franklin is a good read, but not quite in the same league with those other three. I haven't read the recent Washington bio (I forget the author) or the Doris Kearns Goodwin bio of Lincoln yet.
Just finished "Washington's Crossing" by David Hackett Fisher.
Currently reading "Wild at Heart" by John Eldredge and "Engines of Creation" by Eric Drexler.