Do you want adjustability? If so, Ground Controls and Konis.
No, then maybe H&Rs and Bilsteins.
Or cheaper, BAT kit or something similar (BAT springs or Roush springs if you can find them with spax struts for a bit cheaper).
Classifieds of this site is a good place to start.
Bigger rear sway bar.
Poly bushings.
If you have money left, a rear strut tower bar.
You can always upgrade the tires, it can make a huge difference.
