First off, I know these cars fall into different catarogies, this is just for the sake of having true info.
Top Speed (Tested at Nardo (Nardo basic info here: http://www.silhouet.com/motorsport/tracks/nardo.html))
Enzo Ferrari - 355 km/h
Porsche Carrera GT - 334 km/h
Mercedes SLR McLaren - 334 km/h
Lamborghini Murcielago - 330 km/h
Bentley Continental GT - 323 km/h
Aston Martin DB9 - 309 km/h
Acceleration - 0-100km/h AND 0-300km/h (Tested at Nardo)
Enzo Ferrari - 3.6s / 26.1s (lots of wheel spin)
Mercedes SLR McLaren - 3.8s / 30.6s
Porsche Carrera GT - 3.8s / 34.2s
Lamborghini Murcielago - 3.7s / 37.6s
Bentley Continental GT - 5.2s / 67.2s
Aston Martin DB9 - 5.0s / 74.6s
Handeling - Tested at 1600m handeling track.
Porsche Carrera GT - 53.86s
Enzo Ferrari - 54.98s
Lamborghini Murcielago - 55.82s
Mercedes SLR McLaren - 57.45s
Aston Martin DB9 - 58.82s
Bentley Continental GT - 61.66s
Hope you found this useful.