I probably voted for a C cupper before, but the more I think about it, the more the B cup seems ideal to me. If you're larger than C cup you've eliminate about 90% percent of off the rack womens wear like tops and dresses. More, though, B to C seems like the difference between a woman being seen as a whole woman and being seen as a body. From C cup and up your breasts usually become your visual focal point. That may be money in the bank if you're a stripper or a boat show model, but most of us would prefer to be seen as a whole person-- brain and all. The B cup is prominent enough to express a feminine form, but not so outstanding as to call undue attention to itself.
That said, it's too bad we can't change breast size like we can clothing fashions. Oh, wait, maybe we can (sorta).
