I was wondering what to do to update the suspension on my 2001 Asra Sri 2.2L

I was thinking of getting a set of Koni's shocks $AUD1100 and ebach springs $AUD550.00.

For those of you who a similiar Astra in the UK, what have you done.
I look forward to your advise as you have better knowledge of available aftermarket parts.

Cheers
Russell