If the person doing the PPI knows what he's doing, you should be in good shape. It's an almost 7 yr old car, he's bound to find something. Other than that, read this forum like crazy. It's helped me immensely with my '02 S. Oh, also pick yourself up a Bentley shop manual for $60-$70. There's one on eBay now:
http://cgi.ebay.com/ebaymotors/PORSCHE-BOXSTER-S-SHOP-MANUAL-BOOK-SERVICE-REPAIR-REAL_W0QQitemZ310169082913QQcmdZViewItemQQptZMotor s_Manuals_Literature?hash=item4837849c21
Hope your PPI and purchase work out.