Thanks, guys. I think this is the dress, although I'm keeping an eye out for a petite. It keeps popping back in different regular sizes lately so it's not out of the question that a petite will appear.
So I think I am set for dresses for the two events immediately around the wedding, although there is still another reception in June (for Boston people that were not invited to the wedding) that will need a dress as well (another cocktail dress, not black) but I still have a little time for that.
I do have a question about what bag to carry w/ this but I will start another thread for that!