depends on how low you wanna go? if you get the eibach pro-kits (about 1.5 drop), u may get away w/o a camber kit, but if you go any lower, a camber get is recommended if you wanna keep your tires for long...
i'm riding on eibach sportlines (about 1.7 drop) mated with agx on ingalls camber kit and ride is great. I also suggest that you obtain everything (springs, shocks, camber kit if needed) at once and install at once, saves you some install time and headache

so yea...check out what kinds drop you want, then check out the brands....eibach, h&r, neuspeed... then shocks, kyb, koni, tokico...and like bonestock said...depends on your cashflow