Founding Father?

George Washington is a bit of an enigma to me.  I mean, we all know he is considered great, and the father of our country.  But still, for all that, I realize I don't really know too much about him.  Not in an adult sense.  I love Lincoln.  Lincoln seems self-evidently a great president, a great man, yet Washington, while I'm sure worthy, is opaque to me.  

Any thoughts on the Lincoln-Washington comparison?

I'm realizing this when reading, Founding Brothers, by Joseph Ellis, a book I saw recommended at my local library.  It is rather good, almost sneakily so.  And it has made me realize I'd like to learn more about Washington in the same way that I have recently explored Lincoln.  

Any suggestions on a good Washington biography?