Tanabe would be it, or any coilover that comes with spring rate of 5kg/7kg, which is a notch lower than most.
Most you have a choice of being in even numbers. I had the typical 8/6 on my S14 as DD. It was slightly on the rough side, but that was me coming from tein springs. To some, it ain't rough until get 10/12.
There's a thread that was made in the past on the spring rate of many kind and brands of coilovers. I believe it was in the drifting section.