I kinda agree with Bruce Achterberg. At first, what gets my attention is Subjective Reality and Conscious Business, but that's mainly personal preference.
Beliefs (with or without the context of LoA) is a good one too, but does not really catch me up.
I also agree when he says that you should do something that only you could do. I'm sure you'll write a great content on any topic you choose, but I really think you should choose based on what you could create uniquely, not only a better version of what's already there.
I haven't read you book yet (I pre-ordered, but Amazon predicts it'll arrive here in Oct 28 :/ - I'm in Brazil), so once I read it I may be able to give a more accurate opinion on what I think would be a good complement.