Evidently, the jury's still out: ac360.blogs.cnn.com/2008/04/09/got-milk-go
...which is to say, there's not enough data to say organic is better...but that isn't really the same as saying conventional milk is fine, is it. If the soy debate is enought to make you avoid soy, I'd say go with the organic milk, though animal milk naturally contains hormones, organic or not. Have you tried other non-dairy milks? Almond milk and hemp milk are my favorites, both in unsweetened vanilla. The hemp milk can be pricey unless on sale, but I get almond breeze for $2.50-3.00 for a half gallon. It's not organic, but it's hormone free and very tasty.
Congratulations on completing the treatments! I hope you are well and staying strong...