As a Business major (you can declare Finance later), I would swap SMU over Tulane if you want to add a private school. I would also suggest you add Arkansas, as it is stronger than LSU. Second the other posts about adding Indiana. Since you live in TX, I would have a compelling reason for leaving TX or a border state. Most of the border state schools have OOS merit for TX applicants. Travel time and weather will be a hassle the farther you drift from DFW.
Make sure you keep your rank in that top quartile.