I have not used the diva myself, but I know that a lot of women like it. However, it sounds like you don't like one of the integral components of the diva's design. Since you are in the position of having to replace your dive gear, why not look for another model of bcd that incorporates the features you like about the diva, but doesn't have the sportsbra?
If you search through scubaboard, you'll find many reviews of lots of different bcd's which may give you some ideas of other brands/models to look into. You may find something you'll like even more than you liked your diva!
otter-cat