Help a Girl Out!

So here is my dilemma.... I have a wedding St. Patty's Day weekend at Pelican Hill. It is a black tie wedding (i.e. in my head that means a long dress).  I have all of ONE long dress so I am RENTING, yes, RENTING a dress from Rent the Runway.  While this semi scares me because I've never done it before, I've heard great things (via the internet), so thought I'd give it a shot.

I've narrowed it down to TWO dresses, this is where the dilemma is.  Which one should I wear?

Now.... what do you all think? I need some MAJOR advice here! I already rented the Halston Heritage , but am second guessing it after stumbling upon the Nicole Miller.

P.S. The girls boobs are A LOT bigger (Size D) than mine, hence the fit would be a little different so keep that in mind!

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