The larger diameter rotor will help with repeated stops because it has more mass to absorb and dissipate the heat and prevent fade. But, the standard rotor is probably large enough to create enough torque to slow the car quickly or lock up the tires. At least a couple times before fade sets in. I think unless you are doing auto-X or a lot of rapid deceleration, brake fade probably isn't an issue. A good set of performance tires will make a world of difference in stopping distance and contribute to better handling. Other suspension components will affect it, it has to work together as a system. For the few hundred bucks to upgrade to the larger rotors, I think it is worth it but probably isn't going to change your life.