If you like the Meyers-Brigg test, you might like the Enneagram
as well. FWIW, I've found it to be even more accurate than the Meyers-Brigg as it attempts to take into account an individuals level of good (or poor) mental health at the time when describing different personality types. Or at least that's how the book by the same name was laid out. I haven't tried their online version yet.