I noticed that the X-6 is often a big improvement for low to medium skilled drivers, as it is stable and easy to drive. But atm quite a few drivers are returning to the B4 as well (e.g. flipside on this forum, Kampenhout GP 2008 winner) as they think it's faster.
The car you choose is just personal, whether it is a S2, X-6, B4, XXX-CR, RB5 or anything with 4 wheels, it has to suit your driving style. So go out and test some of the cars of fellow racers and decide
