I'd shy away from any option where you borrow money to acquire a 30 year old car.
Some folks think that the early turbos are poised to be the next big thing...if you believe that then your resto, whether garage queen or driver quality would need to be "correct" and original in order to preserve value. Maintaining originality may not give you the most fun 930 driver.
As Rocket mentions, its a good time to buy. Lots of nice cars for sale at relatively low prices...like this one:
http://forums.pelicanparts.com/porsche-cars-sale/531043-1987-porsche-930-fs.html
Looks like you are set up for a good time no matter what you decide. Good luck.