I'd start by contacting Corvette and other high performance speed shops in your area. I'm in the process of acquiring a V myself and I've talked to several of these types about "tricking up" the performance. The key, of course, is that you have to have a dyno and know how to work with the programming codes to maximize hp and torque.
For a few hundred dollars and a few simple changes you can make yourself (like changing the air intake and filters), you should be able to get a 10% improvement in hp (up to around 500). Then you'll have an expensive, but classey, Z06!