My favorite-ist sports bra of all time is the Alexis bra by Moving Comfort.

http://athleta.gap.com/browse/produc...tbbtyr_Cebqhpg

I am small (A cup) and this bra is nicely lined to shape and enhance rather than smoosh completely flat. And because it's lined, there no "nip" if you get cold. It wicks sweat awesomely and dries fast. I have at least 5 at this point as I'm also an aerobics Instructor so I wear 3-4 a week.

Love it!!