depends on what you want to do and how much you planning to spend.. coils can cost anywhere between 1300 - 3000 depending on branding and model.
it seems that lots of people around the forum recommended Buddyclub N+ they around 1600+ and both height and damper adjustable.. you could also look at Teins SS (mixed review on them).. for tight asses you can go for D2 for about 1K from Ebay (but heard they use shyty material), Skunk2 about 1.2k i think