Steve,

I think whats important to consider is set-up can have a larger affect than just the weight bias of the car. A rear heavy car like ours can still be tuned to understeer, just as a car with 50/50 bias will not handle neutrally unless it is properly set up to do so. For one of our cars being street driven and occasionally run down the strip I would still prefer a rear weight bias. The car will be quicker down the track, brake better in emergency stops on the street, and have just a touch of understeer with the standard staggered tire sizes. You could give up performance by moving weight forward to make the car more straight line stable, however you could also tune the suspension for more understeer if you wanted and keep the weight to the rear and not lose any straight line performance.