I buy Horizon Organic milk most of the time for my daughter. I buy the whole milk with the DHA. Ther reason I buy it is for the DHA because my daughter won't eat any fish and I think it is important.
For it to be certified organic it has to follow the rules set by the government, so I do believe that it is truly organic as far as the US government is concerned. The article posted below is from 2006. I hadn't read it until today, but I would search out more recent information before I change my choice, since the article is quite old and it seems to me that the organization that was making the claims has a history of making claims that it can't prove.
I don't know about the hormones, however I do know that all milk produced by cows contains hormones as part of the normal biology of reproduction and lactation. There is no such thing as hormone-free milk. I think what other brands advertise is that no synthetic hormones are in the milk. I am pretty sure that Horizon states this on their packanging, but I will definitely double-check this. Again, I don't really know much about the hormone argument.
I wish you luck in your decision. My advice would be not to stress too much about it. Choosing organic