Hello Sarah,
I personally find that read the entire PMBOK twice will be the most chalenging part of my studies. Hopefully I will not need a lot of time to read everything.
I have decided to use Rita's PrepBook as well, I have read some good reviews about it. A friend of mine have also used it and recommended.
I have planned my studies as the following so far:
1. Watch the complete PrepCast alone.
2. Read Rita's PrepBook followed by the related content again in the PrepCast.
3. Read the complete PMBOK

4. Answer questions related to the previously studied content. Once all content is covered, start with the 200 questions exam simulation.
5. Review the contents I need to improve and try new questions until I can answer 80% of NEW questions correctly several times.
My only concern with this approach is the time needed to read the PMBOK and if it will somehow negatively affect what I have already studied.