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Hubcentric is nice because it helps take load off of the lugs, but then they're supposed to be able to support the wheel, so it shouldn't be an issue, although most people will try to tell you that it IS an issue.
Cone-seated lug nuts (which I'm assuming the Boxster uses...I haven't taken off my wheels yet) will usually hold the wheel centered just fine. I've used non hubcentric spacers and/or mounted wheels without spacer rings to make the wheels hubcentric for years without problems with wheel balance on the race track or street. As long as you tighten the nuts in the proper star pattern and torque them down properly, it's all good.
Technically, I'd go with hubcentric stuff all the time, but if you can't get it or it isn't affordable, I wouldn't sweat it. A lot of wheel manufacturers will try to sell you silly little plastic rings for hub sizing. Yeah, THAT'S gonna work...
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