whatever tires you decide to buy, DO NOT put the oem conti's back on the car
I absolutely hate continentals, they are hard unresponsive tires.
Ive rolled through a set in 21,000 miles. the last set i had on my 240 maybe lasted 2,000.

The nitto invo is a promising new tire, we just put a set on our c6 z06 and they are holding up nicely, soft compund, takes power and is a very responsive tire