Your question is a little vague. I'd need to see a rider for the headliner, as well as # of pieces is the openers. Lights or no? Staging or no? Backdrop or no? Do they have their own FOH ops? What's event security? What is event schedule? Not enough information to quote. Also, you might see some pretty large differences in 'what you can expect to pay' coming from all of us and what you will pay in your area when you find something available. Depends on how busy the production co's are and how much they like you.
If you're looking to profit $2000+ over what the sound system rental is, you'd better be one helluva FOH man. They'll find a production co for a lot less than that. Around here they'd hire the University tech services for an event that size.