i'm about to purchase a wheelset for my '90 rx-7. i'm leaning toward the kosei k-1 wheel. i know i want the 15x7 w/ 5-lug bolt bolt pattern. but what is the offset everyone is running? tire rack has the wheels at $139/each. any place cheaper? since the car is going to be track car in the beginning (until late summer/early fall) i'm looking at the yokohama A032R tires in 225/50x15. advice? suggestions?

thanks,

mike