Kumho 712s are autocrosser's favorite best bang for the buck. The compound is really soft so it bites good and the sidewalls are pretty stiff. Good for autocross. Falken Azenis are another good bang for the buck autocrossing tire..

Nankang never heard of it, is that chinese? As for nittos I know they are good for drag but the sidewalls are soft so they won't make a good autoxing tire.