Okay, I've been watching the threads for some time on the Z-28 and never posted. Frankly I don't get the hype. Who really cares?
If you know what you're doing, you can easily build the SS into a much more capable car than the Z-28 is forecast to be. Even if they were to advertise it as 600HP, that would make in the neighborhood of 500 at the wheels. Spend 6K on a SC and a weekend of work, you can easily beat that number. Plus the aftermarket blower will support much more HP in the future. Anything that comes OEM will be conservative. No way around it.
So other than being the first kid on block, I don't see it. To each his own, but just don't assume you're getting a night and day difference between the two. As a comparison look what people are doing with GT500s. The factory blower is the first thing that goes when they want more out of it.