I actually 2nd the Frog bra rec but I know the high armholes and mega-compression aren't for everyone. Ditto for the over-the-head style and non-ventilated cotton (though they now have a new slippery-fabric model with ventilation...don't know if it's on the website or not).
A small in the original fabric works well for 28/30 band sizes; the saleswoman said the ventilated fabric style is currently better for 32 bands.
[I also have some Moving Comfort high impact styles but they can't compare to the Frog; I've demoted them to medium impact.]