I think for a ROAD CAR, you reach a point of diminished return. IMHO, I think anywhere between 500-600hp and 400-500lb/ft torque is perfect. Anything more is unusable excess.
But I'm sure as the tire compounds improve and suspension setups continue to improve, I may change my mind in the future. I used to think 400hp was more than enough...
Current rides: 2010 CTS-V sedan, black raven; 2010 Cadillac Escalade ESV, black raven
Gone but not forgotten: 2008 M5, metallic sapphire black, SMG; 2004 645ci, metallic sapphire black, SMG