Baby name help needed!!?

I am so torn on these 4 names. We love all 4 but all 4 have a drawback and I cannot decide. The choices are Natalie, Delaney, Olivia, and Stephanie. Natalie is probably my favorite but I already have an Allison and we call her Allie alot and I think they sound very much alike. What do you think? Which of the 4 do you think is prettiest. Middle name options are Katherine, Madeline, Christine, and Victoria. Feel free to mix and match middle names. Thanks!