Man almost to many to choose from.
I'd have to go with the bmw m3 gtr 2001. It wasn't a super car, it wouldnt make a cop look twice, to girls it would be just a typical car. The ultimate sleeper, beautiful, sleek, mix of a touch of luxury and a heaping dab of sport. It turns 0-60mph in about about 3 seconds, you heard right 3 **** the world seconds and you sir are gone.
Honorable mentions: db9, lotus elise series 2, porsche 911 gt3, and the mercedes slr mclaren.