First, hormones have been outlawed in the use of meat sold in the US. So you dont have to worry about that, however conventional meat has antibiotics that you could live without. I say do some research about farms in your area that might sell grassfed beef/organic meat in bulk (sometimes as low as 3-4$ a lb). If thats not an option, conventional meat will have to suffice but make sure to take Omega3 supplements, as the ratio of conventional meat (3:6) is not as good.
Wheat is never a good option, organic or not.