I'm an ass man, so breast size isn't that big of a deal to me. I'll take anything as long as she has a tiny waist, narrow hips, thin, muscular thighs, and round firm backside. If these attributes are present, I'll take anything from an A cup to a D cup.
Anything bigger than a D cup, and the other attributes are never present at the same time. If they are huge on top, they are usually huge on the bottom, and that's just a total turnoff for me.