Good question - as you progress in the game you are forced to drive Le Mans type racing cars at 200mph+ and it's much less fun. Out and out speed isn't everything. The cars I really enjoyed the most are:
- Alfa Romeo TZ2 - a classic, not fast but you can get the tail out at low speeds and control it so it's a joy to drive; if you hook up a good lap you'll feel the difference
- Ferrari 458 Italia - beautiful and handles really nicely with a controllable dab of throttle to help turn-in when you need it (many people prefer the 430 Scuderia but the 458 feels better to me)
- Amuse S2000 GT1 Turbo - a fast car that is really easy to drive, almost impossible to spin
- Ferrari 330 P4 - mainly for the history and beauty of the thing, a priceless collectors piece to look at in the garage and an occasional treat to take it on the track