(I don't know how you quote specific points on here)

Definitely watch American Psycho, if you like that, then read the book.

Of de Botton, I quite liked "The Consolations of Philosophy" where he uses some of the Philosophy/wisdom of people like Epicurus, Seneca, Montaigne, Schopenhauer, Nietzsche, and how it may help you in your daily life, I read it about 20 years ago, it's a quick read, not too in-depth. "How Proust Can Change Your Life" was another decent read, "Status Anxiety" wasn't bad either. I kind of liked his books more for the other writers/artists he turned me on to.

I recommend Baltasar Gracian's book "The Art of Worldly Wisdom" (translated from the Spanish) which is basically the book Greene seems to have ripped for a lot of his 48 laws. It's a small book of 300 maxims, but does the job.

One writer I've read bits and pieces from is Michel de Montaigne, I'd like to read his complete essays but have never got round to it.