I just finished this:
http://www.amazon.com/The-Antidote-Happiness-Positive-Thinki...I think you will like it. It paints Buddhism and Stoicism in a very pragmatic light.
I second the Discworld recomendation. The series is fantastic. Read everything Pratchett has written, it is worth it.
Also: Ishmael by Daniel Quinn: the only book to truly explain the genesis scripture.
The prophet by Khalil Gibran: One of the most beautiful books I've read.
And please ignore Paulo Coelho books. Paulo Coelho is to Richard Bach what Dan Brown is to Humberto Eco.