go with fern bay gold reverse, club reverse or black reverse if you want an easy track..if you want somethign tougher go to south city..any of the configs are fun..you can try kyoto national rev or forward..and most of the aston configs are ok..
use radial blur on the wheels, not motion blur..that is if your trying to get the effect of the wheels spinning (and dont forget to select the tire too, not just the rim )