9 cup or 12 cup? I'm looking at the kitchenaid food processor and cannot decide between the 9 cup and the 12 cup. I have an old popular model and I have no idea how many cups it holds.. as you cannot fill the bowl with water to measure it as it leaks out at the stem opening.. so I don't know the difference and which I need. can anyone tell me the dimensions of the 9 cup and the 12 cup bowls? Height and width?