Many thanks for that. It's exactly what I was thinking about.
Personally, I like the idea of pull quotes. Just one or two in a page can help give visual references to the reader, are an established convention in print media (and web I suppose) and can present the opportunity to add some style.
The only other thing that worried me was wondering what might happen to someone using a screen reader? If I use a pull quote, I duplicate the text so that it renders on the page where I want it after it is floated which means that if you were looking at the page without styles it would appear out of context. It might even be a portion of a sentence that would just appear tacked on.