Are you looking for less lean; less "spongy ride" , or less understeer (better balanced car).

If you want the "spongy" feeling to go away, get stiffer front struts (e.g., Bilstein HD's). The rears will need either the Euro Sportline wagon self-levelling struts, or stiffer springs to remove the spongy feeling.

Less lean in front, install bigger swaybars, BUT you will have more understeer unless you install a bigger rear swaybar.

My order to reduce "sponginess" would be:

front struts
rear struts
500 Rear swaybar
Sportline front swaybar
500E (daily driver) or Sportline (stiffer than 500E) springs all around

:-) neil