not sure how accurate this list is. just googled it:

1. Bugatti Veyron - 400 km/h

2. Koenigsegg CCR - 388 km/h

3. McLaren F1 - 372 km/h

4. Ferrari Enzo - 355 km/h

5. Porsche Carrera GT - 334 km/h

6. McLaren Mercedes SLR - 334 km/h

7. Lamborghini Murcielago - 330 km/h