There are 4 different cat 9s on that cruise. 9A to 9D, with the 9A being the highest (most expensive) of the cat 9s. I believe that the 9D would be 153 points, the 9A would be 176 points and 9B and 9C are somewhere in between.
FYI -- we booked the Mexican Riveria cruise for Jan 2011 last month. The stateroom categories change in 2011 to align with the new ships. It actually makes some rooms less expensive. I didn't pick up on it right away and almost booked the wrong type of room just looking at the category number. We sail on 23rd Jan for that cruise.