A stock C5Z and a stock C6 Z51 6sp are pretty close in performance.
Both have been around long enough that if you want xxx rwhp it will cost xxx $ with these parts!! All the hard work has already been done for you!
That pretty much leaves body styles and colors as the variables!
I can't make myself like the flat azzed C6..........
I love the look and rake of my C5Z!!
You are missing the point of the Corvette if you are a 1/4 mile junkie!!
Apex's and brake points are the cars forte!!
Good luck and have fun!!
Ken