| Ok I have absolutely no experiance with any apart from Eibach.
I have 18" wheels atm with Eibach upto 40mm lowering springs. There has never been any rubbing issues and they have settled very well. The ride is absolutely outstanding on nice roads and even on bad roads it is not too bad.
It has been a very good decision on my part getting it done.
Im in work atm but when im home I will post a pic up of what my car is like with them on. Infact you may be able to see the car in my sig slightly but I will post a better picture later on for you.
oh btw, handling has improved ALOT!!
I posted a thread somewhere before titled "18" wheels and lowering" or something along those lines. I asked basically the same question as you and got alot of responses. From what they were all saying eibach is the popular choice.
Hope that helped slightly | 
