I just found this cocktail dress on pinterest (great site btw) and LOVE IT! It's a pageant/homecoming/prom cocktail and the price is fairly reasonable.
I originally was looking for a rehersal dress, but our dinner is going to be outside around a pool so this may be a bit much. Perhaps I could use it as a departure dress for leaving the reception & then take it on the honeymoon for a fancy dinner night.