Bilstein PSS9 (9-way adjustable coilovers) would be a good choice. More expensive than sport springs, but more adjustment options. I hear you can set it up for competitve driving and then back to a pothole street setup with a few minutes on a lift.
If you plan to drive the car competitively, these springs will pretty much bump you into a class of competition where the Boxster is out of it's league. For street and DE at the track, the PSS9 setup is highly recommended.
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