Cheaper option than the Brembo calipers, and you can keep your existing rotors, would be to retrofit Sumitomo 4-pot calipers (off R32GTR, 300ZX etc) with a custom bracket. Was speaking to my workshop about it earlier last year, if there's enough interest I can use my car as the guinea pig. Will clear most wheels, too. No need to go for whack offset.
The Sumitomo calipers come in small, medium and large cast too, same internals but the large casting can give a BEEFY lookin caliper
