Karmafunk, as one of the 928 owners told me a few months ago when I was in the market for a 928S, "
You don't buy a budget 928, you budget for a 928."
There are a few things to remember:
1. All 928S are at least 8 years old.
2. 928s are supercars of its days, especially the GTS.
3. When there is no service records/history, walk away and don't look back.
4. Budget at least couple thousands of dollars per year for maintenance and service.
These cars are a joy to drive and still turns heads. They are also expensive to maintain. However, if properly maintained, they will last forever, as Dr. Porsche intended.
I suggest that you check out the 928 forum on Rennlist.com for more info. There is a huge community of owners and experts hanging out there.
By the way, my 1986½ 928S is a dream! Good luck!