If you go 2" then defiantly get spring kit & castor/camber plates.
You can lower the car 1"-1.5" w/o adding caster/camber plates but will have some
negative wear on the front tires. If you rotate often then its not really a prob.
If you have a staggered setup where you cant rotate tires then you need the CC plates. I have the plates but havent installed them yet.
The correct way is to get a good kit like Eibach AND caster/camber plate and have it re-aligned.
If you want really cheap then just cut out 1/2 or 1 full coil out of springs. If you dont like that then spend the cash on the parts.