Spring rates, which to choose....

Hey guys,
I am thinking about getting some koni yellows or kyb agx’s and i’m not sure what kind of spring to get. I want something that doesn’t lower car much and that can be taken to the track yet drive on the street. I’m not too knowledgeable about spring rates and would like to know if anyone can suggest something for my application. Also, is a ground control coilover setup really worth it? Thanks guys!

heres something that was in the FAQ section, spring rates and drop

http://www.son240sx.ca/forum/viewtopic.php?t=1730

I have agx and sportlines that I’m installing next week, i dunno the quality of the ride yet lol