Five grand, stoptech front & rear w/ adjustable proportioning valve. Tune suspension for specific driving conditions, e.g. oval, track, drag. Mostly the brake packages will help you dissipate heat faster. For everyday driving with the occaisional haul down from 150 mph, consider the following:
If you can lock them up now with the standard brake package, what will bigger rotors & more calipers do for your gripping capabilities? You can achieve lock with either one.
My answer to that question is nothing at all. On dry pavement in staight line deceleration, all things being equal, ABS will not shorten your stops significantly. ABS is for inclement weather & braking through a turn while maintaining control. Depending on your circumstance (drag or track), what you have now may suit you fine.
I was shopping brakes & decided against the expenditure once I realized all I would get is a firmer feel. (for MY APPLICATION- everyday driving, no racing at the track) At the end of the day, I would be able to obtain threshold braking with either package, and since boiling my brake fluid prolly aint gonna happen, I didn't need a $5,000 brake package.
$0.02