if you have raced before and understand relatively well how to set up a car, and are considering cars at the level of the pro4;
-go with a belt car (less maintainance, heaps of people have jumped from pro 4 to the cyclone, tamiya etc)
-go with tamiya belt
-yokomo BD
-xray fk04 or 05
-or the tamiya ta05 (needs a few hopups)