the c6Z is an animal. Pure and simple. It's a supercar, for 38-50k used, traps 123-128mph in good weather bone stock, and turns with the best of them. A custom dyno tune bone stock will get you another 15-20rwhp, and bump you to around 29-30mpg on the highway.
I just ran 1320 event at Lone Star Raceway last month with a few guys. One of the guys had a stock c6Z, had little track experience, and was ripping off 126mph passes. Though his ET wasn't great, that is just ridiculous.
There are a few cars with just headers, intake, and a cam getting close to 600rwhp, and right at 9's on drag radials with completely stock wheels/suspension. Not too bad for 4 NA mods and an IRS car that was never set up to drag race.
The c6 is a refined car, not in the sense of European cars, but you will not get the same muscle car feel that you will with a sn95, New Edge, C4, or C5 car. Eitherway, I wish that I would have waited another year or 2 and gone with a c6 Z.