If you don’t know who David DeAngelo is you should definitely get Double Your Dating. It is a classic.
It comes with 3 bonus ebooks, a free Interviews With Dating Gurus starter kit with two double interview and one free month of his Interviews With Dating Guru monthly series.
David teaches being cocky and funny along with changing your attitudes and the way you act. He also is known for introducing new gurus to the masses.
For me, David’s material brought the most change in me of any guru’s.