All I've done (referring to sway bars), is replace the rear bar with a 1 3/8" bar. I also have a 1 3/8" front bar to go onto it as well, but haven't had the chance yet.
I have Koni shocks with air ride at all 4 corners, so I'm sure that contributes quite nicely, but I love the way the car handles with just the rear bar.
The labor/time required to swap out front bars is much higher than for the rear bar. The rear can be done in 30-45 minutes, while the front bar requires you to drop the front subframe (with the engine supported above), basically the same procedure for changing the oil pan, or installing headers... That's why I'm doing all of that at the same time.