Here is mine, but it changes all the time so...

10. Porsche 911 GT1 Strassenversion

09. Audi R8 5.2 FSi Quattro

08. Ultima GTR

07. E-type Jaguar

06. Lamborghini Aventador

05. Ferrari Enzo

04. Lamborghini Muira

03. McLaren MP4-12C

02. Ferrari 250 GTO

01. McLaren F1

Here's mine, I don't think you'd be surprised by my choices .

10.) Nissan Skyline R33
9.) Honda Civic EG6 B16A with ITB's.
8.) Nissan 300zx
7.) Subaru Impreza
6.) Mitsubishi Evolution IX FQ400
5.) Nissan Silvia S14/15
4.) Nissan 180sx with SR20DET swap from Skyline
3.) Mazda RX7 FC/FD
2.) Toyota Supra 2JZ-GTE Twin Turbo
1.) Toyota Carina E with 7A-FE + Turbo conversion

1.BMW M3 E46 CSL
2.Nissan S30Z Fairlady
3.Nissan GTR KPGC
4.Nissan R34 Spec Nur II
5.Shelby GT500 SS 2012
6.BMW F10 M5
7.Ferrari 458 Italia spider
8.Lamborghini Aventador lp 700-4
9.Porsche 911 CarreraS 2012
10.Bugatti Veyron