Bumper I can do 200 for.. however I see your in SC soo shipping a bumper may be a little pricey.
The Spring rates on the Race coilovers are which ever stock setup powertrix makes with them.
I believe its something like 6 and 8 the coilovers have adjustable dampaning built in as well.
Heres there site with all there info on the coils..
Coilovers, Springs, & Struts
My coilovers are in the middle of the page.. they retail at 1250.00 My price is 1000.00 shipped these have roughly 1000 miles on them, and 2 of the little caps are missing for on top to adjust dampning. cant be expensive to replace those though..
Let me know if your serious just email me.