as far as spring rates go, deciding whether to put stiffer springs in front or rear is a debate. ESPECIALLY on a front drive car. many ppl will put stiffer spring up front, and stiff yet not-as-stiff-as-the-rear springs in back, it has something to do with getting your front tires to the ground and reducing body roll. but then others will tell you they do the opposite. best answer:
1) go to your local race track and watch FF drivers race. then abduct a driver and interrogate him/her in your basement. (watch old episodes of 24 to see how jack bauer does it)
2) thank the hostage...er...uh, "interviewee". use that advice and select some springs. test them. clock lap times. repeat. buy a different set using the opposite tuning method. test them. clock lap times. repeat.
3)finally, use your data to select the best spring rates for YOUR style of driving, and run from the police.
i hope this helps.