Coil Spring Ratings

I am looking into buying new coil springs all the way around for my car (91 auto.) to better support weight inside the vehicle, but i'm not sure what the rating should be for them. I would like them slightly stiffer than the stcok rating. any thoughts?

Try and find some Suzuki Swift sedan springs. They're much stiffer to support the heavier car. Your car will sit a lil higher tho.

thanks bud....where can i find swift parts?