I never upgraded sway bars. I like the car just fine with the OEM ones.
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I have the ClubSports, and I think I've said this in some other thread, but they're borderline too soft for the track, but just. I don't want to go any stiffer on the street.
Another thing to keep in mind is that your anti-roll bar is tuned for softer springs, so on firmer springs, it has a smaller relative contribution, so your car will roll less because of stiffer springs, but it'll also compensate less for roll it does have due to the anti-roll bar. It "feels" like the car rolls more as a result. I don't care, since the grip is much better, just something to be aware of.