With a stock or stock style 4 link there is no reason to go above 300 lbs/inch. On the front you can go crazy if you want, 1000 lbs/inch. Eibach, H&R, Griggs, there are lots of people that make good srpings.
For shocks and struts, its all about how much you want to spend. Tokico Illuminas are good, Koni double adjustable, Bilstein and others may better, but cost more.
Check out:
http://www.maximummototsports.com/ http://www.griggsracing.com/
They have some good info, prices, and recomended usage charts for various applicaitons.