The route I went was Koni's sent in and converted to double adjustable. At that point they are basically 8611's. My preference in spring rates were higher for the front (650) and lower (400) for the rear. Your preference may differ, but remember to keep in mind the details of spring installation when making a comparison. The rear springs on the omni sit on the shock and act almost directly at the wheel. If you are comparing to a setup with a different lever arm distance it makes a big difference in the effective wheel rate.