I've always heard sways are most effective suspension upgrades assuming all of your components are in good condition. I've also heard the rear sway is the one that makes the most difference as the front is already pretty beefy.

If your car is anything like mine, I noticed a HUGE improvement from replacing all the worn out rubber bushings in the front end with poly including the steering rack bushings, and adding new end links and poly sway bar bushings all around.

 

item delivered yesterday - thanks