quality wise Kics, H&R, Eibach are top notch. personally i have several sizes in Kics and Eibachs. i like the Eibachs because no need to buy the centering rings separately.
ichiba's are okay, not the highest of quality imho but they work fine.
there's other ebay ones too, not sure about strength on those... i would not want to find out on my car.
