I did some research and concluded that the current model of the Kitchenaid meat grinders wasn’t sturdy or versatile enough to be a good investment for me. The older all-metal models would be, but it’s very hard to find a range of grinding plates for them now.
There is an all-metal attachment made by Jupiter/Chef’s Choice that is adapted for the Kitchenaid (they also make them for other mixers.) I found the best price and a better range of grinding plates than you can now get from Kitchenaid at http://www.pleasanthillgrain.com/
It’s just arrived and I haven’t used it yet, but it promises good things.