Eibach pro-kit?
I've heard the sagging issues too with the prokits, but my rears were fine for the 3 or so years I had them. Coupled with a good shock these are a nice spring for a street-driven car IMO. If, however, you plan on doing much beyond that, you will probably find that the springs are somewhat on the soft side. Especially the rears which are notorious for bottoming out. I ended up replacing my rears with Hypercoils and that has been a big improvement - drop was virtually identical to the prokit springs (in the rear anyway).

