I like that new Z06 but am now in the place where getting the fastest car is not that important. I have a 750hp 911 turbo that is tuned for various boost settings - I drive it on the lowest setting (~500hp) 100% of time the last 2 years. Its been dynod three times, 650, 675 and 709, AT THE WHEEL on three different dynos and its still AWD. Who cares - 500hp in car that handles well is more than sufficient unless you're driving a massive bus like the GTR.
I also had a supercharged 2002 NSX, with tons of other modifications thrown at that car, for many years. Honda missed their window to produce an R8 or MP412C - they've both been out for years. The new NSX wont be that great IMO. I dont think that it will be a standout vs the R8 or McLaren, or even the Gt3s
For my money these days Id buy a used 12C or get that new Cayman Gt4.