It's the crappy stock struts & shocks that make things bouncy. The resistance in a cheap shock is greatly increased with piston speed, so you really feel the sharp bumps. Better shocks are digressive valved, so the sharp bumps aren't as bad.
Bilstein's provide a great ride & handle decent spring rates.
The pro-kit front springs are too light. I'd look for something around 600lbs or so.
The location of the spring on the control arm determines the wheel rate.
You wanna keep the front & rear weight per wheel rate about equal, or bumps will cause front/rear pitching, and you'll get sea sick (if the struts/shocks are under-damped).
Front wheel rate ~ spring_rate / 4
Rear wheel rate ~ spring_rate / 2
The stock springs are around 400# & 200#, corresponding to wheel rates around 100#. BUT, it's not a 50:50 weight distribution... closer to 60:40. So if you run a 100# rear wheel rate, you should go for a 150# front wheel rate... ie 600# & 200# springs. (You might want a little more rear rate with the verts heavy rear).
Also, as you lower the front, the control arms become more angled and the roll centre gets REALLY low (possibly below ground). This means you'll actually increase the front roll (if you don't use stiffer springs).
H&R makes great springs, and they have stuff specifically matched for your combo.
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