If you can sort your MC then the 8 pots would be amazing, although the calipers are fairly cheap the discs and pads are expensive. Discs £500+ Pads £100 (pagid basics) - £400 (aggressive such as pagid RS4-2).
I've never looked too much into the rears although I saw a handbrake + bracket setup (still needed main caliper/ discs/ hoses and pads) sell for £500 or so a while back, would look amazing though