ok wonka, i know you said you wont have enough for a brake kit, but you actually do! you can get the akebono brake kit that comes with the sport package and even in red to match your car. ive been thinking about doing this myself since i have the non sport model. and on top of the sport package brake upgrade, you can get some stillen j hook or some drilled and slotted rotors for even better performance. heres the link and feel free to rep!
Z1 Akebono Sport Brake Upgrade Package