I'd reccomend calling Turn in Concepts. The guys there really know their stuff and they will help you set the car up for what you want it for (track, spirited driving, autocross, etc..)
I went with the whiteline front (24mm) and rear (22mm) sway bars and the kartboy endlinks. Both bars are adjustable. They greatly reduced the body roll and improved the handling. I do not track my car but I go on lots of weekend drives with other cars on windy mountain roads and we beat on our cars pretty good.