If nothing else, I'd go Koni (either Sports/yellows or the FSDs) over the OE Sachs because they last longer and have a lifetime warranty. My factory Sachs were completely shot when I removed them at 10 years and only 50k miles. You can't go wrong with Koni.
Also, those descriptions of drops in ride height on TireRack due to the Eibach springs are normally for non-sport package equipped cars, meaning the drop should be less for our Performance Package (ZHP) cars. A few members have Eibach springs, they can tell you what they experienced.