looking for better suspension then the nismo suspension

[yushinrt]

i am currently driving 2013 nismo but i want to upgrade my suspension,
i track my car once a month (fuji speed way) and use my car as sunday street car.

i love the nismo suspension around the track but i getting little sick of the bumpy ride on street, i wish i can change the damping on nismo but i cant so i was thinking of upgrading the suspension.

key factor is

i use the car for track and i use it for street.
i want someing which is more smooth less bumpy on the street.
but i dont lose the performance.
ride high i might drop it 1/2inch but not much lower then standard hight
about the price i am not to worryed about but something under 4k