I called Kitchen Aid customer service because I am in the market for my first Kitchen Aid mixer. I looked at the models my local BJ's Club offered, and they had a model that sold for $269, which was in the 300 watt range, maybe 350. I asked the customer service rep a little about the various models and what was special about some of them. The reply was that the motor is much more powerful in some models, and some models have bowl lifts, while others do not. They were mostly the same after that.
They then offered me a 525 Watt, 6 quart model, new, a close out, and in mostly any color I wanted, for $279, and free shipping. One year warranty. List on this is $429. How could I turn that down?
There are differences in the new models and the 20 year old model you may have. For one, the old model doesn't have the slow smooth start they incorporated into new models to keep flour in the bowl on startup. The new models also come with a thermal breaker, not so on the very old models.
The reply to the question about 14 cups of flour is that it translates to 6 cups of bread flour, or dough. I told her that I could push 6 cups through the $50 ($37 on sale) model I bought in my local Wal Mart. The difference being that the model I used had smaller cork screws in it, they are much easier to turn in dough than the curved hook that Kitchen Aid spins. Plus they rip through the dough, I didn't like it.
As far as buying a Hobart, or any other industrial strength mixer. I have a family kitchen, we cook our dinner in it, and I make a 1.5 to 3 lb's of dough for rolls and other breads. If you are runing Pizza Hut, or some other business, you needed more than a Kitchen Aid mixer, that's why you killed it.