There is only one choice in my opinon... get the supra TT brake kit...
Those brakes can give you over 1,700 Braking Horse Power (as much as a McLaren F1) used with slotted rotors! (see first link)
Here is a link to a guide on converting the system....
http://www.lexus.australia.as/entry.htm
You can buy all the parts BRAND NEW FROM TOYOTA at wholesale from this link
http://www.trademotion.com/partlocator/ind...747&catalogid=0
THAT TOYOTA WORLD link is great... i ordered the WHOLE FRONT KIT for $600 (without rotors) brand new and they look great! They are a Real Toyota Dealership who sell wholesale on the inet.
TRD pads are the best but i couldnt swallow $300 for the front alone... so i went with axxis... havent installed yet because i think i need bigger rims that 16".
Good luck, hopes this helps!