I have to say I like some curves and C is about right for me. Any bigger really doesn't do much for me. It's the whole package anyways, I also like the outside dirty girl's. If it takes you an hour to put on your make up and do your hair your not for me.
Basic guide lines, 5'11" and under, weight-less than me, Bra size-more than me. Yep, that it's it. Everything else is flexible.