Hi Bob,
I'm in the process of doing the same thing - sort of... The price of my 85 Targa has shot up substantially (from the price I paid), and I was planning to sell it for a Boxster. Instead, I decided to keep my 85 911 and buy a Boxster anyway...
I'm in the process of purchasing a 2000 Boxster (base model), with 63k miles on it and a factory hardtop. The PPI is scheduled for next week and if all goes well, I'll have the same shop perform the IMS upgrade, RMS and new clutch. It's an extra $3k when all done, but it gives me piece of mind. As an FYI, the 2000 model year can have either a single or double row bearing in it. This shop will replace the current IMS with a double-row bearing, courtesy of LM Engineering's Phase 2 IMS. The double row bearings have a 1% failure rate while the single row have an 8% failure rate. It's an insurance policy, but one worth taking, which is why I'm having the PPI done too.
I'm looking forward to nice heat and AC in a Porsche... Good luck in your search.