As a male, I feel I am also an expert on boob, so here is my two cents: Most guys have a preference as to big or small, but always overriding that is, are they nice looking. Most guys will take nice looking small boobs over funny looking big fakers any day. That being said, these last two weeks, I have seen two girls that I thought had perfect tits, albeit on different ends of the spectrum.
ChloeClark: Big, round, supple and beautiful
Renee: Small, round, supple and beautiful. Taken a few years ago, but I can assure you they are just as perky. It was the only bare shot she had.
So advice is, if you like what you see in the mirror, leave them alone, the guys will like them too. If you have to enhance, tread carefully, because for every Chloe success, there is one of these: