i'm an autocrosser so i'll voice my opinion. if you posted this topic under the autocross section you know what you'd hear? GROUND CONTROL. i have 350f/450r paired with koni yellows and i love them! don't waste your money...call up ground control and tell them how you want your car to handle and they will sent you the rates you need. i'll leave you with some professional advise...
http://www.redshiftmotorsports.com/ChrisTech.htm

here's some more input from carreview.com
ground control: http://www.carreview.com/Suspension/...0_2882crx.aspx

skunk 2: http://www.carreview.com/Suspension/...6_2882crx.aspx

hope that helps