I'm currently 34D+
(I even had reduction surgery from DDD to C, and oddly, bra manufacturers changed the labelling so what was a C cup is now a D cup... go figure! I still have the old C cup for proof!).

For cycling I actually like the Pearl Izumi schimmels or their other sports "bras".

But for more active endeavors, like running or volleyball, my current favorite is by Brooks Pro-Support--and comes in band and cup sizes for a great fit.

For day wear--well, what's my favorite is not longer available the next time I go shopping (or the fabric changed or cut changed slightly to "improve" it), and varies by what I'm planning to wear over it. Have better luck w/ the european brands--they just seem to have better styles that fit well, too. E.g. Chantelle, Triumph, Freya... www.figleaves.com is a good place to check.