Argument with an Evo...

Kidding. So are you going to auto-x your car? Why are you wanting to focus on handling at this point? What is your end goal?
I have H&R Sport springs, better rubber than stock and have to say I am very pleased with how it handles...for how I use the car at least.
I've swapped to coils on almost every car I've had and never had a complaint-from myself or the wife.
I am not sure if you need springs. Generally speaking it’s all about shocks. You would valve the shocks based on your performance goals and springs complement the built shocks. So increasing spring rate without shocks will only have marginal effect. I guess installing extra 100-150lb and 0.25-.75in shorter in the rear will be ok. But first do the bar and tires. If after that you feel you need more – tune further.
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