I have a Addco performance front swaybar I got from summit. Not sure about the rest but it work with or without original equipped cars. I have yet to install it so I can't comment on the quality or performance yet. But Im sure it will be a great improvement over what my non-equipped car is now.
I will be picking up a matching rear as soon as I can. Through Summit Addco is cheaper than Hellwig by about $60-$100 than the Hotchkiss is even another $80 on top of that.