The regular Boxsters, 986, 987 and 981, can all handle top speed with the top up. The 987 Spyder's roadster top had a lower top speed limit with its top up than with it down. The 981 Spyder doesn't have a lower top speed limit with the top up. I've got nothing to add on top down, other than to say make sure the plexiglass wind deflector and the roll bar screens are correctly snapped in place.
My own 2003 S has its original top. I am tall and when seated in the car my head is about 1 inch below the inside of the top. I can feel some buffeting in the top fabric at 80 mph occasionally.
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