Rotor size inquiry

For street duty, I have never needed more than the factory KH 4-piston set-up, and I think those are right around 11. And the Bonus is I can run any factory wheel 14" and over, and probably anything except an old steel chrome reverse with the flat dinner-plate spiders.
I have been to different tracks on two just separate occasions, and both had plenty of shut-down area.
With a manual trans and 11/1 compression, I hardly need brakes.