Yeah we're just getting into the best time of the year for a Boxster! 
Shop around for some used wheels. Original 16" would be best (if you have stock '99 Boxster brakes), but there are a lot of great tires for the 17" wheels. Then just put new tires on the used wheels and swap them out when the time comes. I used Dunlop Wintersport M3s on my Boxster and they were terrific.
Good luck!
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Doug
Currently Between Porsches
PART OF MY SOUL: '09 Boxster 2.9 PDK, '86 911, '76 912E, '06 Cayman S, '90 911 C4, '74 911, '78 911 Targa, '01 Boxster, '70 911T, '99 Boxster (#2), '72 911T, '88 911, '99 Boxster (#1), '84 911 Turbo Look, '73 911 Targa, '88 944
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