[x]

So far as I know, David Donald's is the best.

There was a lot of hoopla about Ronald C. White's thick new biography last year. You could take a look and see if it's really that good.

People have also had good things to say about Benjamin Thomas's and Lord Charnwood's biographies, but you'd probably want to start with something more recent to see the latest state of scholarship.

[winstonwolf33]

Whoops! Looks like x snuck in his reply before I clicked the "Post" button.

A. Lincoln: A Biography by Ronald C. White, Abraham Lincoln: A Biography by Benjamin P. Thomas and Michael Burlingame, and Abraham Lincoln by Baron Godfrey Rathbone Benson Charnwood are also in the running. :P