well you have a coilover setup that's just used in conjunction w/ your stock shocks/struts or after market like KYB,kokico etc or a full Coilover setup that contains that but you pay a little more for a complete coilover setup.

like these:
http://cgi.ebay.com/ebaymotors/ws/eB...category=33582
or
http://cgi.ebay.com/ebaymotors/ws/eB...category=33582
or full coilovers
http://cgi.ebay.com/ebaymotors/ws/eB...category=42609

Tein is an awesome company when it comes to coilovers. the big thing w/ the CO is that you adjust the ride height unlike w/ lowering springs where you are at a set lowered height. I hope this might help you out a little in your search and understanding..