After market springs opinion

hey guys i was just wondering what you all thought of Eibach Sportline springs? they would give me a 2.0/1.5 inch drop on my 05 6s. they seem to be reasonably priced (at least i think, correct me if im wrong). i guess i dont really know much about springs and what i should get. also i dont really want my front bumper to rub all the time, any opinons would be greatly appreciated. also.... since i am new to this modding thing, if i get new springs do i have to get new shocks or anything? or can i just get new springs and be good to go? i have stock rims and wheels on it too.