Try the cocktail dresses on
www.anntaylor.com. If you are busty, I would stay away from anything strapless, and watch out for cleavage. Try a good minimizer bra if needed, so that you have excellent support and appear more proportional. Maybe a color block dress with a darker color on top, if you can find one that looks classy?
I also think that v-necks are good, because the draw the eye up, as long as it doesn't show cleavage. Did you ever see Bridget Jones's Diary? Renee Zellweger put on about 20 lbs. to play that role (all in the bust, apparently). She wears a black v-neck dress at an anniversary party, and it looks great.