Thank you for the input. I'd like to keep the discussion to the chart if possible though. I'll add in the rageshaper, which helps any of the natural attack builds. I included the bastard sword just to see what happens. I though that it might be useful to take advantage of iterative attacks and against a foe with DR or situations in which higher single damage is more useful than volume of attacks.
Updated Graph Here's an updated chart. This is the original excel sheet, so you can see where the data comes from.
If I've created the chart correctly, then I have three observations:
1) At ACs less than 13, the bastard sword combined with natural attacks does more damage.
2) At ACs higher than 25, the purely natural attacks without power attack does the most.
3)Between 13 and 25, hasted greatsword with power attack does the most.
For the ACs after 13 though, pure natural attack and greatsword are within 2 points of damage and therefore the hasted greatsword is not that clear of a winner.
This does not account for situations in which you are unable to get a full attack. Because of improved natural attack and rageshaper, I'm not sure that a greatsword even wins in those cases. It looks like the extra strength on the bite is enough to even the playing field there too.