if your into the tao te ching, check out the hua hu ching, translated by hua ching ni. its a later work of lao tzu. far more revealing.
I would take the two I just ordered by Yogani cuz I haven't read em and they look pretty sweet, I know how to pick em. Ones about pranayama 100 pages and the other is Q&A between student and guru about deep questions 500 pages.