Time to think about next round of upgrads me thinks!!

I don't want to invalidate my warranty so I think a suspension upgrade is required.

I already have the Prodrive springs on my STI 8 PPP and am trying to understand whether the addition of rear anti roll bar, anti lift kits or rear drop links would help.

Does anyone have any pearls of wisdom for me on how the handling would change or advice on where to go?

Cheers again guys.