Don't forget the performance increase from decreasing rotational mass. The biggest performance gain my car has gotten was dropping 8lbs off each corner with lighter wheels and tires. If I can find some weight listings on aftermarket rotors I think even bigger gains could be had here.
I noticed that much more than the intake/exhaust or sway bar/endlink/springs combos - although I will say replacing the broken end links with SPL ones allowed me to tighten the swaybar (actually re-attach it) and that made a BIG difference in cornering speeds vs running with broken stock ones (and one not attached). Not necessarily a power increase but definitely allowed me to keep the car in the power band through corners much easier.
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