Springs with Factory Shocks?!

[Dfer]

Just got a Euro spec RHD 2001 S and am going to do a few mods.
I want to improve the suspension as I do 6 or 7 club events each year to keep my had in.
I'm tossing up between 1) just adding lower H & R springs to the stock (Euro) shocks ; 2) going to Bilstein PSS 9's or 3) a full H & R coilover set? I think I prefer the Bilsteins but, as I drive the car daily, am concerned that it might be a bit stiff? Anyone have an opinion ?

I want to buy the suspension , '03 clear light upgrade etc from USA as its cheaper that way vs buying direct here in Australia. Can anyone suggest a reliable supplier?