http://forums.elitistjerks.com/viewt...hp?id=6225&p=2
Starting at post 37.
It's not so much a calculator as it is a comparison between a few pieces of select gear. Your mileage may vary, but the key thing to note is that Windfury is what you
should be giving your warriors. Rogues are just along for the ride, so if they're trying to get GoA for a very marginal upgrade (at the cost of the warriors 20% extra rage), they should be shot.