Not necessarily about SLU, but I've been dealing with the same issues about my top two schools: NYU and Brown, which are reputable schools in their own right but aren't necessarily public health powerhouses like Columbia, Emory, JHU, etc.. I've been accepted to more "reputable" programs and I kept telling myself that mattered the most. As I've done more research on the programs I've gotten over my fear of "reputation" and am trying to focus on what it is I'm looking to get out of the program and what they can offer me so that I can meet those goals for myself. I think you are going to get out of the program what you put into it, so definitely keep that in mind! I think it's also important to keep in mind that no school is going to be absolutely perfect, whether they've been established for 5 years or 50 years. Visit if you can, I am hoping my visits to the two schools sway me one way or another about the choice I have to make.
Again, sorry this wasn't about SLU specifically, but I think a lot of us are considering reputation as a deciding factor so hopefully this will help you a little!