I agree that the Country Living grain mill seems to be the most rugged one out there and the easist if you gring huge amounts, however, I bought the Family Grain Mill and could not be happier with it.
I really like the modular nature of the unit, I have the grain mill as well as the oat flaker. It also has a powered base and a converter so that you can put it on any KitchenAid mixer with a PTO unit.
There are also numerous other attachments for it including a hand crank base, vegetable processor and a meat grinder. Quality is excellent and mine has seen a lot of use with no issues. I would recommend it to any one looking for a good grain mill with a lot of value and expandability to it.
I bought mine at Pleasant Hill Grain, good prices and great customer service.
http://www.pleasanthillgrain.com/index.aspx#Nutrimill