Finally a topic I don't feel like a newbie to on the cycling forums!!

I highly recommend the Trade Up bra from Title 9. It is sized by band/cup size, and the straps that go over your traps are adjustable, as well as the band (two-hook closure like a regular bra). I cannot say enough good things about the exact fit and durability of this bra, with the added bonus that it can be adjusted to fit you exactly!