I've read many of the books listed here and a number of my clients have confirmed their effectiveness as well. I originally was attracted to the best ones as they were judged to be excellent in a book entitled The Authoritative Guide to Self-Help Books written by John Santrock et al.
If you embark on a journey of self-discovery and guided personal growth, keep track of your progress in a notebook of some sort. A written record helps to sustain momentum when discouraged by inevitable plateaus and set-backs. Remember, it takes time and effort to develop the self-awareness necessary to cultivate wisdom.