To me, KORE is hard to beat. It fits perfectly and performs exactly as advertised, just pick the kit/cost that is right for you. I can tell you that I have the base kit (now called Recon maybe) and unless you are nearly racing, it seems to handle everything very well. The handling difference over stock is significant - really.
The KORE kit is also expensive, particularly if, like me, you have to pay someone to install it (I did the rears myself - I don't mess with front ends though), but you are getting what you pay for.