Harrop have some fabulous brakes on offer that will meet a Commodore / HSV bolt pattern and a number of other cars as well.
http://www.harrop.com.au/Home.shtml
But remember, brakes alone are not the thing - all you really need to is to exceed the tractive capacity of the tires at any speed and to be able to do this with enough conistancy against heat and fatigue.
I think ABS is a good thing to have, and I reject the philosphy that race drivers dont use ABS. Actually in "Tune to Win" Carroll Smith predicts that racers will use ABS if it isnt illegal - I think a modern computer controlled four wheel independant ABS system will brake better and more consistantly that any human ever will.