I've had upgraded sway bars on other cars and I can say that switching sway bars on a car is the most drastic single thing you can do to alter the way a car handles. That statement includes going to more aggressive tires. It has always changed the entire dynamic of the car. For this reason I'm only going to replace the stock bushings and maybe swap out the end links. Just my 2 cents.
"The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace." - Automobile Magazine