Price of auto insurance for a 20 year old?

I'm 20 years old with a completely clean history, no tickets or accidents. It would go on my mom's insurance policy, which is also clean, but I'd be the primary driver. I've had my license since 16 years, 3 months in Virginia. What would the cost be around if I get a 2006 Mustang GT (V8) coupe, manual? Also, I get good student discounts. Thanks!