hey I have a 98 cavalier rs 2.2 . I have gutted the interior except for the dash, and a drivers seat. I am wondering what will have a bigger impact on handling, buying the eibach swaybars & rear strut bar ( I already have the front strut tower brace), or getting the sportline kit and springs? I am concerned that the specs for these springs are for a normally weighted car ( full interior), and my empty cav will be handling wierd as a result. I will do the work myself, so I wont need to pay labor.

what are a good set of springs for the eibach sportline kit (bigger drop)?

Sportlines are springs, you need shocks.

I think if your car has a lot of miles on the OEM shocks you will notice more of an improvement with the replacement of your shocks and springs. If your shocks and springs are fine then I think the swaybars will make a bigger difference.