springs? get eibach pros or sportlines, hothkis superforms, or tein s techs springs.
coillovers are better (but much more expensive) and you'll be better off going with tein ss, tanabe pro, hotchkis, and i think skunk2 makes good coillovers as well.
of course...my favortie suspension is air bags, though. (sometimes cheaper and imo, better than coillovers). although coillovers are more reliable you can beat instant adjustability and it's so much more show quality.