Your best bang for the buck is to get a shock/strut/spring combo on ebay. I got the Tokico one and was very pleased, i think i payed less than 350$....it lowers about an inch all the way around, just enough to where you don't have to get Caster Camber plates.
If you just want to do your springs, then i recommend the FRPP C Springs (you don't need cc plates with these) if you don't want to spend too much.
Or if you don't mind spending more the Eibachs and H&R's are nice but you will need CC plates because they lower more than in inch all the way around.