what swaybar set up are you currently running and how much do you care about street ride comfort?
for mostly street driving id go with a swaybar set like suspension techniques and go with a set of tokico illuminas/bilsteins/koni's with 350f, 350-400r spring rates.
if you are mainly using this for autox/track days id say go with a stock si front swaybar and a comptech rear bar, with rates of 400-450f and 500-600r. its going to come down to driver preference and also ability to handle a car that likes to get a little tail happy. if you drive normal on the streets you will have no problem, but if you drive agressively on a daily basis, be careful of lifting throttle or braking around sweepers.