I've got the H&R/Bilstein setup, and it's great. Be advised, it's somewhat stiff, so if you have a higher mileage car with old bushings, it's going to put quite a bit of stress on them, and you will notice a little more vibration if yours are going bad. I would recommend Bruno's Thrust arm and Subframe inserts to compensate for that. I haven't had any experience with the Sachs kit, but i hear it's liked by almost everyone who has it. The Bilsteins Sports are a pretty stiff damper, but it doesn't sacrifice ride quality.