$200 seems a little steep, but it depends on your area. I can drive 90 minutes from my house and get fish half of what I pay locally.
As for the potential aggression...you can't predict that. Ideally they would be introduced at the same time, but a lot of this hobby does not work ideally. If I were guessing, there will be the usual new introduction aggression, but if everyone makes it past that, you will have a beautiful fish.