While in my experience a cheap Porsche is NEVER inexpensive, the rewards are quite nice. And places like Pelican Parts make it easier.
And just think how this sounds: "Honey, I think that I'll take the Porsche today...."

That said, from your description, I would wait and find a better example. The 1986 has a VASTLY improved interior, and likely won't need as much work.
And watch the insurance: I looked at a 928 a while ago, and when I checked the insurance it was $2000 Cdn. A little much for a toy.