If you just want a mild drop for a daily driver, a lot of guys have used Swift springs and have been happy with that. I myself have BC coilovers on my DD but I sit pretty low. From what I hear KW are quality coilovers but don't go as low as other brands but if your not looking to slam your Z you should be good. If you look through some of the wheel threads you should be able to get a better idea of what different specs looks like, but if your ordering a custom wheel like SSR I don't feel that you should need to run spacers, just proper offsets. Hope this helped a bit.
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