Lane, with reference to what Mickey just said, please get your head examined.
Marty, we forgive you. We know you bought the Boxster because Sandy wanted it. :)
Tom, I had two 928s back-to-back, and between them they were my daily drivers for almost five years. I don't think I've ever had a better car than those, but goll-dangit they were expensive to maintain. One was an '80 automatic, the other an '81 5-speed.
I spent about $500/mo to keep them in pitch and tune, and when the parts started to go, so did my Visa balance.
Figure on adding a 50-percent markup to whatever an equivalent 'Merican part would cost, and that's a good starting point for 928 parts.
Porsche no longer supports the 928 at all, and I kind of got the idea that maybe they wanted to forget they ever did. I don't know why, though. I loved driving them. Maintenance-intensive as they were, they weren't new cars -- and they were true thorobreds. I think the only thing faster than the '81 might have been the Maryland Air National Guard.