It really comes down to what you want, honestly for me I would probably pick the Grand Sport Corvette over the ZL1 Camaro......
The Grand Sport with the Z07 package as tested by Car and Driver put down an impressive performance.
http://www.caranddriver.com/reviews/...al-test-review
0-60: 3.8 seconds
0-100: 8.7 seconds
0-120: 12.9 seconds
0-150: 24.1 seconds
70-0: 129 feet
skidpad: 1.18Gs
The Grand Sport as I would option it would only have the Z07 package, comp. seats, and maybe a wheel options comes up to $77,500 bucks.
Also Katech advertises a package for $9,000 gets you 600BHP and 523ft-lbs of torque from the LT1 engine if you really wanted more power.