Howdy,
I was looking at coilovers for my R33. Its daily driven, but goes to the track lots with my semi slicks. I ended up getting the whiteline/bilstein combo of springs/shocks. I think my springs are around 5kg front and rear. Ride is firm but not stiff, yet awesome ride on the track. No idea how people drive around with spring rates of 10-12 kg, YIKES!!!
I didnt have over 2K to spend on good coilovers, so settled for these and am VERY happy indeed. I have raced it 4 times with this suspension, its perfect, can drive it home, then get the groceries the next day and it rides all bumps perfectly.
There is another link here with lots of Coilovers info:
http://www.skylinesaustralia.com/forums/Re...St-t266632.html
lots of good reading here mate.