I would think the 5 quart is sufficient for most of us. I have the Classic with a 4.5 quart bowl. Would have preferred the 5 qt but this one came up on a super one-day-only discount, so.....it rocks!  I can make 3 loaves of banana bread at one time in mine. In fact, it's better if I do. One loaf barely has enough butter to process in the machine. It gets lost in the bottom of the bowl. This model came with a dough hook and recipes for bread in the manual, so presumably it can handle bread dough though I haven't tried it. When I was researching the models, I also came up with that if you make bread a lot, the Pro would be a better choice. But I have a breadmaker so I figured why duplicate gadgets. Manual for mine says that attachments with the white coating are fine in the dishwasher but not the wire whisk which is metal and I imagine it's the same for all models.