Man those are cheap! so cheap! already in Oz too. I reckon even a very bottom of the range coilover like this will be ok for a street car.
I noticed that in this ebay write-up they go down to 4kg/mm springs. When i was talking to someone at Racing Logic in QLD (I have those c/overs) he said 6kg is the lightest you want to go with in the front, and 5kg is the lightest you want to go in the rear. I went 6kg F & 6kg R just like the teins FYI. I wouldn't imagine spring rates would differ too much between brands, as it should be a universal measurement, and the weight of the car doesn't change!

