Try some polly bushings for the sway bar and endlinks. That will stiffen up the feel and response.
Check your control arms, seems later models added the svt style arms that had the extra metal on them. Depending on what syspension you are running now, you shouldnt increase the size drastically. Used SVT bars (21mm) or even Steeda/Progress (22mm) are a good size and increase. Check the buy/sell sections here, normally there is one for sale. You cant really go wrong with a used bar, number of miles on them dont really make a difference.