3/4 HP Cabela's works great for me. It is large enough that you don't have to worry about every tiny piece of silverskin being trimmed off, as it won't clog up like the cheapie grinder we used to use.
I can't imagine needing anything larger than the 3/4HP unless you routinely are doing maybe elk or more than 6-7 deer. We did 3 deer and it was hardly warmed up....
