Has anyone installed any of these upgraded suspension kits?  Or anything else that has made a big difference to the suspension of it?

In my autocross days, I found that using the Chevrolet 1 1/8" front bar and a 7/16" rear bar made the car pretty close to neutral handling. While I'm rebuilding the front suspension now, I'm going to put on a coilover system. May eventually use a fiberglass rear spring.

If you are going to replace your rear control rods, I've been told to NOT use ones with poly bushings.  Either go stock rubber or better yet go to the rods with heim joint rod ends.

Thanks for the advice.  I’m potentially doing this upgrade in the new few months. There are so many options from $400 to $2,000. Any other advice would be greatly appreciated.