Depends on how the rest of the car is setup. If you have it setup for straightline, weight transferring, it'll always handle like a bus relatively speaking.
If you're starting with a stock suspension the following pieces made a dramatic difference:
Sway bar bushings
Strut tower brace
Kmember brace 2 or 4 point
This allows the suspension to do what its suppose to. Add to it
Koni red struts
Caster/camber plates
C-springs - stiff enough to improve without losing ride and lowers it a bit.
But don't forget you need to address the rear to with matching springs and shocks, it will affect the front. Lastly, hopefully you have subframes already.
This is basic. If you want to go more extreme any kit from maximum motorsports or griggs. . . .but you should always do complete packages at this level.