Can you get a ride with anyone running koni and HR sports to test it out?
One of many things I like about my KW V1's is that you can set them to the exact height you want. A shock/spring combo will obviously only give you one height. With some of the shock/spring combos the reverse rack would still ever so slightly be present and I knew that would always bug me. (At least thats the case with the e92, maybe not as much with an e90.) Also, I haven't checked the prices lately, but when I was deciding between coils or shocks/springs there wasn't that much of a difference. Although if you already have the springs that's a different story.