I'm using the UPR Pro Series Lowering Springs
. They're made for us by Eibach, to the same specs as Pro Kit springs, but I believe our springs are a lot cheaper. These are great dual purpose springs. My car works just as well on the drag strip as it does on the road course, and it also sees 2000 miles per month as a daily driver, including taking my kids to school. I think you'd like them.
I don't recommend camber bolts. The extra camber you pick up with the springs actually improves cornering, with minimal tire wear issues. I do recommend the UPR panhard bar