Wedding Cake
The wedding cake is something special to the couple, so extra care must be taken to keep it that way and come out with something excellent. The wedding planner or Gibbs (the cake people) who is arranging for the cake must do either one. Either the preparation must be done by someone and decoration by another. If you try and get both done together it might end up being a downer.
I would suggest you to go for a cake from outside and decorate it yourself. This way, you can add a personal touch to it and feel good as well.
The florist can do a nice preparation for the decoration of the cake. Especially the top of the cake would look the best with flowers and stuff.