I used to have a viking which I don't recommend. Right now I have a Bosch Universal Plus however it's not good for small batches and is a real pain to clean. There is a swedish machine the Ankarsrum which is supposed to be the cats meow. When I get around to knocking over the next bank I'm gonna buy the Hausler which is a dedicated bread kneader/mixer.

The Hobart N50 is probably the ideal machine as long as you don't make really stiff dough like bagel dough and 5 quarts is enough for you.