The one place I don't know how to save money is in the food for the reception. Make it yourself is the only option that I know. Try catalogs like JC Penney's for nice dresses. You don't have to tell anyone where they came from. If you aren't set on owning the dresses, including the bridal gown, look into bridal rental places.
Most big cities have at least one and sometimes a few.
Concerning the cake, look into your local supermarket. You can rent the fountains and other accessories for a lot less than purchasing them. The dress had a full train and was made of white satin. A seamstress can do this for you. You may also want to make your dresses something that can be worn again to other functions and ask that your bridesmaids pay for their own.