the rotor not goign to help you stop much faster.. it's really the pad that does the work... you might be able to just cut your stock rotor if it's not at the min. yet and that should run you something like $15-25 per rotor... if your pads need replacing and you want performance.. go with the axxis ultimates ... before you do anything though.. go to
www.cobaltfriction.com all the road racers / auto-xers and daily street cars go there for brake parts...call them up and ask for advice.. the guys there are really helpful and won't steer you in the wrong direction
p.s. visit the auto-x / road race forum on po.com... you learn a lot about brakes and stuff in there
=)