It would be nice if you could order the user leagues by percentage change, that would somewhat indicate how fast the user is building its reputation. Of course show that value next to the reputation as well. Maybe call the statistic "Velocity".
One other interesting statistics is to see the average points per answer a user got (maybe excluding bounties). That would basically show how good answers a user writes. Maybe call the statistic "Answer quality"... you should be able to normalize the point for the answer quality.