Do not go with the roush setup, it slams the rear, h&r is the best way to go.
I have bat struts with roush spring and an aussie bar, and I think it has the car balanced wonderfully. The oversteer is definitely there, but for the most part only when actions are done that would put any nuetral car into oversteer, (hard throttle lifts in corners, trail braking...etc.). I would not recommend this to inexperienced drivers, but for those who have a sense of what they are doing, this setup is very rewarding, I love it.
