How big are your preferred "perfect breasts"

I definitely prefer them smaller, but... (more details below)

Here's what I commented on the last similar poll:

As long as they're on a generally attractive girl, anything from flat to size D is good (ideally being somewhat proportional to her height). After that, the bigger they get, the less attractive they become.

Also, they must be natural. Natural is always better than fake.
A natural flat chest > fake boobs of any size.