I don't know the differences between the base car springs and the ES springs, if any. I know when I had base springs, I liked the smooth ride, and it wasn't floaty or anything. If you want to retain the stock ride height (why?) then either get new factory springs, or keep the same ones on and just get new struts. Tokicos, KYBs, etc. Tokicos I would imagine would probably give a really nice ride when paired with the stock springs. And the springs cost as much or more than a set of Eibachs!!