Honestly, in your case, I would not really recommend the JR Pass. You can go from Osaka to Nara and Himeji using normal lines (JR or Kintetsu, not shinkansen), for a very reasonable cost; same goes from Tokyo to Narita Airport. A single Osaka-Tokyo shinkansen trip costs 14'000 yen, and you probably would have a hard time to manage to spend 14'000 yen on all other journeys (the price of the JR pass is around 28'000 yen for a week).
Except if you think your program might change, and you want to keep some flexibility, it would probably be cheaper to by all tickets separately...
sanji
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