I like the little Suzuki with the Hayabusa motor, was pretty fast once it got going but stuggled on inclines due to low torque engine, which was not helped by the 'too' long gearing. I would always buy that car, gear it properly, then go have fun. That car could really hold some corner speed, and if tuned, was a beast on the ring.
I also really liked the TVR Tuscan speed 6, was always enjoyable to drive, as well as the little Civic Type R, a truley enjoyable little FF car. GT40 is fun too.
I generally like undergog cars, or cars that are strong in some points but weak in other areas. Also, the harder a car is to drive, the more it appeals to me. I like cars on edge, that bite if you are not perfect.
In real life I ride a TL1000S, a motorbike that was nicknamed the Widow maker. Reason being was that it had a dramatic instability problem mainly under hard acceleration, or over bumpy uneven roads. This bike is a challenge to ride, and I have had a few life and death moments on it. I guess I like my GT cars to offer the same excitment but without the risk of death!! lol