"Umm... that... let me think. I suppose, that personal identity cannot be contained within the history of choices that have been made, because for every choice that has been made, if it was truly a 'choice' at all, it was also made the other way in some other tributary of the Great Tao."

I don't like that part at all. As far as I understand those things, just now almost all of your measure/amplitude/whatever went into the version of you that didn't spontaneously stand up and jump out of the window and the difference between that and what would happen in a completely deterministic universe (in which you also wouldn't have jumped) doesn't seem very important.

In fact, I think that the less determined your actions are, the less they are 'choices'. Not jumping out of the window because a quantum coin came up heads may be more 'free' in some sense but if its independent from your past mental states then it's not really something 'you' do.