Etxeondo (most of their line) and Assos SS Lady work for me (34A). Both have full zips and "shrink-to-fit" your torso. The Assos jersey is a bit short, tho. Giordana made a S/S jersey last year called the "Forma" that was good, too. And my team kit is by Voler and they make a full zip women's race cut that I like as well.
Castelli doesn't make full zip S/S jerseys for the most part.