Hi
If your after a comfy ride, then most will do the job, Bilstein are the best though, B4 for comfort
If you after a sportier ride the bilstein b6 are very good, but not cheap
depending on what model of s-type you have Bilstein are standard fit, if your car has CATS, adaptive dampers, then OE Bilstein are the way to go, as you get comfort and stiffer damping, that adjusts to your driving style, but again no cheap
cheers
Joe