Strut/spring combo vs coilovers

[phoryu2nv]

I want to change out my struts, tirerack is having a sale on Koni Yellows, how do I know which one to get 50mm or 55mm? I have a 04 Si

[StimulisRK]

I'd personally go with the stiffest springs possible for our car, which I believe are the H&R springs. To my understanding, alot of spring companies don't actually manufacturer with high enough spring rates cause people will complain about the harsh ride. From what I remember H&R springs are the best match, designed for what the car needs, and not designed for rider comfort.