If you want guys to give you their opinion on looks, one picture speaks a thousand words. There are plenty of hot chicks without boobs, for example Kiira Knightley from Pirates of the Caribian and Bend it like Beckhham movie.
Maybe you shoud go to a website called www.hotornot.com
The most beautifull girl I ever dated had an a cup I wouldn't need a low cut.
For me the size of breast doesn't matter as long as its in proportion. The whole is more then the sum of its parts. Id look at the girl not just breasts if she's atractive id def go for her no matter what cup size.