Just throwing this out there as a suggestion, what if you were to use Rotisserie scoring from the previous years season stats to determine pre-season power rankings?
Say you are in a 12-team league, the team with the most home runs will receive 12 points, the team with the second most will receive 11 points, etc. In the case of a tie, each team involved receives an average of the total points due—i.e., in the above example, if two teams were tied for first in homers, each would receive 11.5 points [(12 + 11) / 2 = 11.5].
So, if you were playing in a league with 12 teams and 12 scoring categories, the lowest point total possible is 12 [12 * 1 = 12] and the highest is 144 [12 * 12 = 144].