Thanks for the information. I just ordered a whisper mill online. After considering the experience of others, and some of the information available at Walton Feeds, I felt that it was worth the extra money. The attachment for the kitchenaid seems to be for only the occasional use, and not for regular milling of grain. Hard wheat will put some stress on it.
I posted the same question on the main board and got several references to other sites. Those interested here might enjoy the information on that other thread.
Thanks again.
Garryowen