> Displacement relates fairly directly to horsepower,
> but not entirely, and horesepower doesn't
> completely answer the question of 'how fast will
> I go'.
Not to get too far off topic but this statement is completely untrue. Consider a Honda VTX 1800 which has a displacement of 1795cc compared to a Honda CBR600RR which has a displacement of 599cc. Despite having 1/3 the displacement of the VTX the CBR600RR produces more horsepower (105.4 versus 94.6).