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Both H&R and Eibach make quality products and I believe both are TUV approved. The Boxster runs a basic Macpherson suspension...not magic fairy dust. Throwing on a different set of springs will change the dynamics but it isn't going to be too much of a crapshoot.
If you do a lot of roadracing (track), then the PSS9 would be a good choice allowing you to adjust ride heights, valving characteristics, and corner balance the car. If you do a little track/autocross, want a lowered stance yet want some compliance on the street, then the lowering springs fit that description quite nicely and a coilover system is somewhat overkill. What's "the best" for the track is not always "the best" for an all around application IMHO.
I use to run H&R springs with Bilstein Sports on my M3 while a buddy ran PSS9 on his M3. Even at full soft the ride of the coilover system was much more harsh on the street.
Interestingly, the Boxster supposedly comes with linear rate springs whereas the aftermarket springs (e.g. Eibach and H&R) are progressive rate.
Check the Boxster racing board. Those guys have tried it all as far as suspension is concerned...
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