Car: 11 Audi TTS

Mods: 19" OZ Wheels w/ 255/35/19 rubber and K&N Filter

Issue: Although it is mainly driven on the street I do track my TTS down here in Southern California. Whether driving the canyons(ie Topanga/Decker/Mullholland) or running the Tracks(ie Chuckwalla, Willow Springs, AutoClub, etc) I have a lot of body roll. This creates a horrible sound of the rear inner fender well rubbing against the rear tires. I was told that with a good Rear Sway Bar this would stop and improve my track times.

Question: I am not looking to just go out and buy the most expensive or the cheapest Rear Sway bar. What would be the best quality/most efficient Rear Sway bar for my car with the given conditions and issue? Should I also get the front sway bar and associated support brackets/links?

Thank you in advance!