If possible, pick a waltz that has can be connected in a personal way to the bride, even if it isn't a "name" waltz--We once played "Waltz Across Texas" at the request of a bride's family, she was from Texas, and ended up playing it three more times(Texans are notably enthusiastic about their state)--Sometimes you can even find a way to dedicate a familiar Waltz so that it makes a special connection, like "Roses from the South"--