I run Hankook ventus on the front of mine, there the road tyre that hankook have and I think there a great tyre! Have them on my road car aswell and the wear is very good on them, and there cheap! I had RS-2s on the 5 series i had before and really I dont think there much difference in the grip between them and the ventus! And honestly you won't want a seriously grippy tyre in drifting, the front needs some give aswell

Ive never tried any other tyre up front than hankook coz i like the way the car is with them