Koni stuff comes with a lifetime warranty, you may want to keep that in mind. That in itself to me was worth the extra money.
I run koni yellows/eibach prokit, the pro kit rear spring rate is exactly the same as a stock iroc spring rate, and didnt lower the rear of my car at all. The front spring rate is a lot heavier and dropped the nose an inch or so. Everything else in the rear of my car is Spohn, no complaints.
SFCs are the first thing you should do before any modification to the car...I know Josh @ JS Performance does an awesome job with installing them, and his price is very reasonable considering he does a lot more than weld them in. He is also a dealer for UMI and can recommend different suspension items based on what you want for the car.
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87 iroc with the usual go fast stuff
heavier than your half ton.
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