I agree with Bampf partially--for a track set-up, i think that it's a safe economical bet to invest in a rear sway bar at first, and then see if it's neccisary to beef up the front, but for a high performance street set-up with track capabilities, i don't find it wise to push extremes on one side of anything without beefing up the opposite. I'm running a 24mm front sway bar with a 22mm rear on my Integra...as i believe Bampf is, as well as Junglistgsr.
Rear slip angle tends to exceed that of the front even with this seemingly mild set-up. I recently took a downhill corner a little too hot with slightly wet tires and ended up doing a cute 540 before i got the car back under control.
If you do heed Bampf's advice, my suggestion is to test the handling in a CLOSED, SAFE environment. Both are illusionary, but try to find the safest environment possible--top speed on your favorite overpass doesn't count as safe or closed. Oversteering FWD cars are ALWAYS dangerous...whether you know how to deal with it or not. I'm well aware that in a tight autocross course, breaking the back end loose at apex to whip around the bend faster is more than welcome...but for a street car, it's important to maintain a degree of understeer--neutral handling is perhaps too extreme for insurance purposes, hehe.
-b