I would say arimidex bro, at .25mg everyday. I don't believe it hinders gains honestly. I believe people think since there is less weight gain that = less gains in general. I've used arimidex throughout all cycles at .25mg everyday and I've stayed dry, and still had great gains but instead of the usual 20-25 pounds its more or less 10-15 solid pounds without all the water and bloat.