You should be able to get hi-spec 285mm 4 pot that would fit under 15" rims. They should be more than up to the job.
I have a 308mm big disk kit with OE calipers, Pagid fast road pads and braided lines all round with a fluid change. I hit them hard not so long ago and it was like I hit a wall :shock: , instant and dramatic deceleration. So, with 4 pots on a 285 mm disk and braided lines, they should be pretty special