I'm a owner of 04 Boxster S and used to have a 98 Boxster and a 90 Carrera 2.

Things to be aware of with 99's are slipped cylinder sleeves and Rear Main Seal oil leaks. The slipped sleeve can be very expensive obviously. The reason why 98 and 99 Boxsters are so cheap is because of the possibility of major manfunctions (probably under 10% chance). In the case of 98's pourous blocks, 99's slipped sleeves, both RMS leaks, misc. oil leaks, convertible top mechanism failures make up the most expensive things that can go wrong.

The early Boxsters are some of the most fun cars of that 986 series (97-04). They are the lightest, loudest, more like a pure sports car.

You will enjoy this car! Congrats. I miss the purity of my 98 Boxster even those the 04 S model is faster and more refined.

Btw, what is the warranty company?